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Cetacean Vacation By Green

A Commission for Mr. Mephit

The sun was just beginning to go down, turning the sky a pleasing shade of orange, as Rebecca walked up the path to the cozy cabin she was staying in. She'd been out shopping in the late afternoon, seeing what the local stores and tourist shops had to offer. As she fished the key out of her pocket, the dolphin paused, as she had every time she opened this door so far, to look behind her and just take in the view for a moment. The cabin was right on the beach, and there was something about the sand and the endless waves that stirred the young marine mammal on a primal level. Her purchases were starting to feel heavy, though, and she was beginning to regret walking back, even if the weather was gorgeous. So she turned back to the door, set into a small cabin surrounded on three sides by trees, giving the occupants a remarkable amount of privacy. It belonged to the family of a friend of hers, who had gladly offered it to Rebecca and her travelling companion, since he wasn't going to be using it this year. Stepping inside and firmly locking the door behind her, Rebecca set her bags down on the hardwood floor and sighed in relief, rubbing a slightly sore arm.

That's when she noticed the sock.

Sitting on the floor just in front of the door was a single sock, one she recognized from that morning, when it had been firmly wrapped around a foot. Tilting her head to the side and smirking in curiosity, she wondered what it was doing there, as they'd kept the cabin very neat so far. Then she saw its twin, resting on the floorboards a few feet away, peeking out from behind the base of a lamp. "Matthew?" she called out, picking the sock up and walking to collect the other, her bags momentarily forgotten. The lamp was placed just at the edge of a wall next to the corridor which lead to the cabin's few other rooms, and it came into view as Rebecca retrieved the second sock. No sooner had she stood up and actually looked down the hallway, though, when she laughed softly to herself and dropped them right back down to the floor. There was a trail of clothing leading down the hallway. "I thought you were dressed a little warm this morning..." she muttered, stepping over a pair of shorts and a tropical vest. It was when she found the T-shirt that she realized where the trail was leading; the deck out back, equipped with a shiny new hot tub for when anyone staying in the cabin felt the desire for submersion in water that wasn't whatever temperature the fickle ocean decided. She turned around, thinking that she could try out the new swimsuit she'd just picked up, a sleek black number she hoped would accent the greys of her skin and show off her figure, as swimming and shopping were hardly the only things that had appealed to her about this vacation. But as she turned around to see to her bags, she saw a paper note stuck to the wall, one she'd missed as she followed the trail. It simply read 'You won't need it', leading a grinning Rebecca to wonder exactly how well he knew her, if he was able to pull a trick like that off.

Opening the sliding glass door, Rebecca stepped onto the small deck in the rear of the cabin, not at all surprised to see that the hot tub, built into the floor of the deck, was already on, nor that it was currently occupied. She smiled as she took in the sight of a male dolphin, just as sleek and shiny as she but slightly more muscular, sitting on the polished floorboards on the edge of the tub, letting only his feet and lower legs dangle down into the frothy, steaming, oh-so-inviting water. Of course, Rebecca was more focused on the fact that he was also stark naked, save for the truly ridiculous straw hat atop his head, which he lifted up as he saw her and pointedly tossed to the floor between them, finishing the trail with a wide grin. Crossing her arms, the female fixed him with a warm, knowing look as he held up a pair of wine glasses. "Ah, there you are, 'Becks," said Matthew, "You're just in time. Champagne?" Rebecca couldn't help but laugh, shaking her head. "So, have you been waiting here naked all afternoon," she asked, her thick, muscular tail swaying gently back and forth behind her, "or have you been keeping an eye out for my return, dear brother?" Running his tongue along the sides of his beak, Rebecca's twin brother chuckled. "If I just tell you," he said, as though exasperated, "it will ruin the magic! Come on, babe, take a load off, have a seat." He patted the floor next to him, then thought a moment, and instead patted his thigh right next to his prominent erection, earning him a giggle and a shake of his sister's head. "You're incorrigible, Matthew," she said, taking a single step closer. "You say that like it's a bad thing, Becca," he said, faux-confused. In truth, the dolphin femme was starting to feel quite warm inside, enjoying leering at her brother's naked body almost as much as she liked the way his own gaze was blatantly roaming her frame, undressing her with his eyes. Still, she was enjoying this moment of banter, enjoying teasing him a little, so she remained where she was, and indicated his hard-on; dolphin genitals were internal, so when he wasn't aroused, there was a simple slit of flesh between Matthew's legs that didn't look entirely dissimilar to the one between her own. But before she'd even stepped outside, his penis had been fully extended from its pouch, fully erect, and now he used the prehensile qualities inherent to their species to make it sway back and forth in time with his sister's tail, something he no doubt found hilarious. Of course, the fact that his little show was turning her on tremendously had no doubt occurred to him as well. "I don't know, it looks like you got the party started without me," she said, "I wouldn't want to interrupt anything..." Looking down at his penis as though he'd forgotten it was there, Matthew made a dismissive wave. "What, this?" he asked, "I haven't laid a finger on it, I promise, this is purely from anticipation. Been looking forward to this all day. Besides, it means I can do this." As the head of her brother's prehensile prick curled backwards, beckoning her towards the hot tub like a great big finger, Rebecca felt a rush of warmth to her lower body and moaned quietly, her playful mask slipping. "Come on in, sis," he said, in a lower, more honest voice that let her hear exactly how excited he was to see her, "the water's fine."

He was already smiling. But as Rebecca's shorts slumped to the floor, he was positively beaming.

Rebecca and Matthew were close, even by the somewhat 'touchy-feely' dolphin standards where hugging, cuddling, and cheek kisses weren't at all uncommon between family members. Twin brother and sister, they'd taken things quite a bit further than that, becoming lovers and lifelong companions. Theirs wasn't an exclusive relationship, each of them had had past flings with both men and women (and delighted in telling each other stories of their bisexual affairs), but somehow, no matter how well they clicked with a partner, in the end, they always drifted away from outsiders and back to their sibling. Their love for each other had gotten them through plenty of hard times, though it hadn't come without its cost; the twins had moved all the way across the country to discourage surprise visits from family, and had gone to great, even extreme lengths to hide the secret of their relationship from their friends and partners. In fact, the only person who knew was their roommate back home, a skunk named Joel, but no matter how many times he told them he was cool with it, and demonstrated as much through his behaviour, they were still too nervous to openly display their affection right in front of him. Which was why this vacation had seemed so appealing to the cetacean siblings. Gorgeous beaches, the ocean breeze in the air, and a cabin for just the two of them to express their feelings in any way they saw fit, without having to worry even for a moment about how the world might judge them.

His job of enticement successful, Matthew slipped into the churning water of the tub, leaning back with a relaxed sigh to watch his sister disrobe. After a moment, the head of his cock popped up from the water like a periscope, as if it didn't want to miss the show. Kicking off her flip-flops, Rebecca stepped out of her shorts with a grin, then placed her hands on her own chest, squeezing her breasts through her clothes before sliding her palms down her torso, where she gripped the hem of her tank top and slowly lifted it up over her head, tossing it to the side with reckless abandon. Turning around, she placed her hands on her ass, groping her rubbery skin through her thin red panties, earning herself a shameless, needy groan from her brother, who she suspected by this point was trembling with the effort required to not touch himself, to savour the moment. Bending over and lifting her tail high in the air, flexing the fins at the end, Rebecca casually reached for the snap that kept a thin red ribbon closed around the base of her tail, and flicked it open. With the panties no longer held in place, she... turned back around, causing her lover to whimper. Giggling, the playful dolphin reached up and back, placing her delicate fingers on the clasp to her bra, tucked just behind her smooth dorsal fin. Rebecca loved the way Matthew gazed at her with rapt attention, the adoration in his eyes bordering on worship. She couldn't help but smile a little wider when he inhaled sharply at the sound of the click as she opened her bra, and deeply enjoyed the shudder that visibly ran through her brother as she pulled the pesky item of clothing away, baring her chest to her twin's leering eyes. "Oh God, 'Becks..." Matthew breathed, sounding as though he'd never seen her topless before. If he'd had anything else to add to that, it was lost somewhere between his brain and his lips, and he seemed content to just stare instead.

Tossing her bra after her shirt, Rebecca walked around the edge of the tub, exaggerating the roll of her hips in her gait just a little, giggling softly at the look on her brother's face; if she had to guess, he was torn between staring at her bare breasts and leering at her covered butt. He never had been able to choose. Fortunately, she knew which part of her body he loved most of all, and came to a halt standing just behind the other dolphin, who stood and turned around to keep his eyes on her. For once, he seemed to have completely forgotten about his erection, which just sat there, its only movements being the slight wiggle accompanying Matthew shifting his body from foot to foot. Standing with her feet wide apart, Rebecca placed her hands on her hips, proud of her near-nudity, and winked at her brother. "So, Matthew," she asked, quietly, "you want to do the honours?" The moment was supposed to be soft and sensual, so she bit her lip to swallow a laugh at how quickly, how eagerly her twin nodded his sleek grey head. To get closer to the edge of the tub, Matthew knelt on the seat where he'd just been resting his butt, and reached up towards Rebecca's hips reverently, with trembling hands. Hooking his fingers under the waistband of his sister's panties, he gently began to tug them down her soft, smooth thighs, letting out a shuddery breath as her treasures came into view, her vulva already glistening with her arousal. Eyes locked on her slit, Matthew finished the task at hand, pulling her underwear down to her ankles, where Rebecca helpfully lifted her feet to free herself. Just as she'd expected, hoped really, as soon as she was completely naked, her brother's hands returned to her thighs, rubbing and caressing along her perfectly smooth flesh until he could wait no longer, and one of his hands made a beeline between her legs.

Rebecca let out a pleasured sigh as her brother played his fingers along her grey outer lips, before pushing between them into the hot, wet pinkness within. Feeling Matthew's smooth fingers playing along her inner walls, she closed her eyes and groaned, clenching down on the intruding digits and gasping when the other hand snuck up and began to toy with her clitoris, which had already emerged from its folds. Meanwhile, her brother was nuzzling his cheek against her thigh, laying a trail of kisses up and down it, as he couldn't quite reach her slit with his tongue, much to his obvious dismay. Rebecca had begun to run her hands along her white underbelly, forcing herself to avoid her achingly stiff nipples, which were more sensitive than the average girl's. Close enough to smell her arousal, and see the white skin around her pelvis flushing a light pink as she got more and more worked up, Matthew licked his lips and started to up his game - just before his sister stepped back, causing his fingers to slip out of her, now shining and wet with her desire. He cried out wordlessly in protest, then sadly licked at his fingers as he frowned at her. "B-Becca, come on," he whimpered, "I was just starting to get into it..." Once more, the other dolphin walked around the edge of the hot tub, keeping well out of reach, until she was opposite him. "I know, babe," she said, gently, "but after you went to all that trouble setting this up, it would seem a shame to get started before I even get in." Looking decidedly unconvinced, Matthew turned and settled back down on the bench as Rebecca stepped down into the steaming water, sighing happily as it enveloped her lower body. He still looked like he'd be okay with her remaining completely dry - at least until he jumped slightly, as his sister had just run the tip of her tail fin along the sensitive underside of his prick. "Now then," she said, smiling again, "how about that champagne?"

Soon, the siblings were enjoying the heated water playing along their bodies as they sat opposite each other, sipping fine champagne and chatting casually about their vacation so far, though the smiles on their faces came mostly from the way they would continually tease at each other beneath the opaque, churning water. Rebecca kept pressing her fin against her brother's penis and enjoying his reactions, only to jump herself, nearly choking on her champagne, as she felt one of his feet gently press between her legs, his toes playing along her folds. She didn't have any particular fondness for feet, so she was surprised when she found herself quickly getting worked up by his touch, but no sooner had she begun to press herself against his foot than he withdrew it with a chuckle. She didn't mind that much, really, she was enjoying the teasing, the dance of foreplay, something they often jumped straight past in their need to be with each other. Glancing up into the sky, Rebecca was reminded both of the passage of time and the fact that she and her brother were sitting completely naked in an outdoor hot tub, something which made her smile all on its own. She relished every second that she didn't have to pretend not to care deeply for this wonderful man, and hadn't felt this stress-free in years. As she passed her glass to her brother to be refilled with bubbly, she sighed happily. Her current positioning helped her mood, too, of course; there was just something about being partially submerged in water that made any marine mammal smile, especially when it was hot enough to soothe tired muscles and aching bodies. Taking a palmful of water and rubbing it over her torso, making sure to only get her breasts once her brother was looking, she leaned back and let out a relaxed sigh. "You know," she said, "I almost wish Joel was here. He does like a good sunset." As Matthew handed over her glass, he winked and grinned roguishly. "Yeah, and I bet his butt would look amazing in a Speedo..." he murmured, following it up by exaggeratedly licking his lips. In addition to being the sole person in on the twins' secret, Joel had also, now and again, shared a bed with both of them, something they liked to talk about now and then, made them feel closer to their roommate, and more comfortable with his knowledge of their true feelings for each other. In the past, they'd discussed between themselves the idea of inviting Joel into a threesome with the both of them, but they were still uncomfortable kissing in front of him, so the idea of having him present while they made love kept that idea firmly in the 'maybe someday' category. Giving her brother a faux-offended look, Rebecca crossed her arms over her bust and sniffed. "Were you thinking about him when I was putting on a show for you?" she asked, "Either you need to get your priorities checked..." standing up, she swung around and sat down next to Matthew, putting her arm around his shoulder, her expression suddenly warmer as she leaned in closer, obviously angling for his lips. "...Or I'm not trying hard enough."

As their beaks parted, the twins closed their eyes, both of them shivering as they pressed their mouths together. Rebecca sighed through the blowhole on the back of her head as she shivered against her brother, eagerly pushing her long tongue forward to meet his, clicking softly as they kissed deeply and passionately, the sunset, the champagne, and Joel entirely forgotten as they lost themselves in the moment. No longer being subtle or coy, the distaff sibling slipped her free hand into the water and took hold of her brother's penis, anticipating and enjoying the way every muscle in his body tensed up for just a second as she gripped his flesh. She didn't begin stroking, not yet, she just wanted to hold him in her hand, feel his pulse quickening through the thin skin, and enjoy the way his kissing became ever needier as his arousal grew and grew. She was the one who first broke off the kiss, though, as Matthew's hand came out of nowhere to grope her chest, squeezing the soft flesh and teasing his fingertips along her nipple, tweaking and rubbing at the amazingly sensitive nub. "God, Matthew, th-that's so good..." she breathed, pushing her chest into his hand and tightening her grip on his erection, feeling it throb in her hand and imagining a drop of pre emerging from the tip, only to be washed away by the rush of frothy water. She felt her brother's hand on her back, gently pushing, and intuited that he wanted her to straddle his lap, no doubt so he could mercilessly lick and tease her nipples while they made love. She had other ideas, though, and slipped off the bench again. This time, the other cetacean actually whimpered with need. "Come on, Becky," he pleaded, "no more games, I'm gonna go crazy if I don't get some relief..." She smiled as she remembered him telling her how he had always liked that name even though she hated it as a child; 'a pretty name for my pretty girl', he'd described it, on the night her opinion changed. Now, she placed a single finger over the tip of his beak and softly shushed him, leaning in to give him a quick peck on the cheeks. "No more games, no more teasing, brother," she whispered, "vacations are all about relief, aren't they? So just lean back and enjoy this..."

Enjoying the look of surprise on her brother's face, Rebecca dropped down to her knees on the bottom of the tub, and after a quick wink, she plunged her face into the water, closing her eyes against the stinging heat; with all these bubbles, she wouldn't have been able to see anything anyway. Besides, she didn't need vision for this particular task. She still hadn't let go of Matthew's dick, and as that hand slid down to his base, cupping the slit from which his manhood had emerged, she reached out with her other hand to grip him just behind the head, feeling it twitch, instinctively trying to move with Matthew's agitation. He'd barely be able to feel licking in this wet heat, and they'd moved beyond teasing already, so she opened her beak and took the head of her brother's penis into her mouth. Thanks to one of the handier traits of their species, Rebecca felt no discomfort or hurry as she settled in and made herself comfy; she could hold her breath for ten minutes if she needed to, but in this shallow tub even that was unnecessary; her upper back and the back of her head were just above the surface, meaning that her blowhole was exposed. She was breathing quite normally even as she began to rub her tongue along her twin's sensitive flesh, feeling it pushing back against her as she licked and suckled and rubbed, enjoying the feeling of the warm water filling in the rest of the space in her mouth. Shivering at the taste of his skin, she began to work her way further along the shaft. Matthew's prick had an S-shaped curve to it, disguising at first glance the fact that it was nine inches long; even someone with as deep a mouth as another dolphin couldn't take the whole thing at once without working up to it. But she hadn't made it very far before she felt a finger poking at her head. Rebecca paused in her ministrations; she'd been anticipating, even looking forward to Matthew's hands gently rubbing and massaging at her head and back, but this poking was something else. Reluctantly releasing her mouthful, she tilted her head back to look above the surface.

Once her eyes focused properly, the first thing Rebecca saw was her brother, looking embarrassed and apologetic. "What's up, Matthew?" she asked, curiously, "Am I doing something wrong?" Rubbing the back of his head self-consciously, he shrugged. "W-well, no, it's not that, it felt great, actually..." he said, "it's just that... when I look down, all I can see is your dorsal fin, sticking up from the water." A moment of silence passed before Rebecca realized he wasn't going to explain. "So?" she prodded, rather wishing she could get back to work. "So," he replied, "I know it's just you, obviously, but it's an instinctive thing... I see that fin, and I hear it in my head..." When she gave him a look that made it obvious she wasn't going to ask again, he shrugged and blushed. "You know..." he muttered, "dun-dun... dun-dun..." Surprised, Rebecca actually laughed out loud as her brother continued to hum the Jaws theme, shaking her head in amusement. Blushing even harder (though he was clearly trying not to laugh along even as he pouted), Matthew crossed his arms and sniffed derisively. "Well, you try enjoying a blowjob when you keep thinking about a shark biting your dick off!" he said, making her laugh even harder. Standing up, still amused, Rebecca put her hands on her hips. "Alright then, I guess I'll have to save this particular treat for deeper water," she said, "and here I thought I was being so clever. Ah well." Bending over, she hooked her hands under Matthew's armpits and lifted. "Come on, up with you!" she said, as her somewhat confused brother stood up. She then carefully guided him backwards until he was sitting on the deck in much the same position he'd been in when she first walked out here, his feet resting in the water on the bench he'd just been sitting on. Stepping forward, Rebecca knelt between his legs and bent over, licking her lips again and taking hold of her brother's shaft. "Now then," she breathed, feeling him quiver in her grip, "Where was I?"

Without waiting for a response of any kind, she opened her mouth and engulfed his shaft; Rebecca realized what had seemed off about her underwater work earlier; she hadn't been able to hear the noises Matthew made as she pleasured him. Such as the shuddery moan he let out as she swirled her tongue around the head of his prick, lapping up his pre-come as she began to bob up and down along his manhood. "Oh - oh Jesus, 'Becks, that's amaz_aaaaaahhh!" She had cut off his praise by beginning to move her hand, stroking the shaft where she couldn't quite reach it with her mouth. As she continued, he let out a series of quiet clicks to express his contentment. She had no hair for him to play with, no ears for him to scratch behind, but it was still his instinctual reaction, as she continued to lick and suckle and tease, for Matthew to reach forward and place his hands on the body of the female bringing him such joy. He let them rest lightly on her shoulders, squeezing and rubbing at her muscles like a simple, very localized massage. He continued to whimper and moan with need, leaking his pre and trembling at her touch; he usually wasn't this productive so quickly, he must have been aching for her all day, something which turned Rebecca on even more. Moaning around her mouthful, she redoubled her efforts to please her lover. As she teased the underside of Matthew's prick with her tongue, he leaned back, tensing up at random, his tail beginning to twitch, slapping against the floorboards of the deck. After a few minutes, the head of his cock began to move, pushing away from her tongue like it was trying to escape the constant stimulation, but there was nowhere for it to hide in the tight, wet, confines of Rebecca's mouth, and she took no small amount of pleasure in mercilessly licking and teasing at his most sensitive spots, taking each gasp, each whimper, each pulse of that beautiful shaft and the flavourful pre that came with it, as victories in her campaign of pleasure. "God," he groaned, shuddering from head to toe, "Ohhhh, 'Becks, I needed this so, so bad..." Matthew inhaled sharply as his sister ran her teeth very lightly along the underside of his erection. "Oh _fuck, sis, at this rate you're gonna make me lose it in no time!" Counter-intuitively, that made Rebecca pause for just a moment, but it wasn't because she thought that was a bad thing. It was because she was surprised by a wave of warm pleasure of her own, by the feeling of her pussy clenching down on itself; those words had really turned her on. Matthew normally didn't like swearing, tried to keep his vocabulary profanity-free. So when she got him to curse while they were being intimate, Rebecca knew that she was really getting to him. But it wasn't just that, she realized; she loved pleasuring her brother, always did it happily, not out of some sense of obligation. But from time to time, like say, now, she got a bit more into it than usual. And right now, as she resisted the urge to moan again, the dolphin realized she couldn't wait for her brother to blow his load, to fill her mouth with his hot come, to surrender completely to the pleasure she was bringing him.

Focusing on the task at hand, Rebecca moved her free hand around to her brother's back, slipping it down to grope and squeeze his pert, firm buttocks. Matthew had let go of her shoulders, leaning back and bracing both his hands against the deck. His legs twitched and jerked as her lips and tongue worked together along his shaft, and his breathing had quickened, his trembling chest rising and falling rapidly as the cetacean panted with need. All these signs were encouraging, but Rebecca had been with Matthew so long that even if he'd managed to stay perfectly still and shush his breathing, she would be able to tell when he was approaching the edge by the behaviour of his penis. As she licked along the shaft and suckled on the head, she felt her brother's cock begin to grow even harder against her tongue, its movements less pronounced as the muscles tightened up. Just in case she'd been oblivious to all of this, though, Matthew was polite enough to give her a warning. "Oh, oh my God... 'Becca, d-don't stop, don't s-stop, I'm - I'm gonna come!" Shuddering with the strength of her own desire, Rebecca moaned loudly to encourage her brother and then, relaxing her throat, managed to get all the way to Matthew's base for a couple of bobs, taking his entire twitching length into her mouth before backing up to keep just the head within her beak and stroking his shaft with both hands to finish him off. Arching his back and crying out loudly and wordlessly, taking advantage of their solitude, Matthew tensed up all over as his orgasm overtook him. He inhaled sharply in time with the bursts of pleasure that exploded through his body, in time with the gouts of hot dolphin seed that spurted forth into his sister's mouth even as her tongue and lips worked his pulsing cock, her hands not letting up one little bit, encouraging him to be as copious as possible, a challenge his body took to with gusto as he came and came, filling her mouth with her gooey reward.

When he'd finally finished, Matthew's arms gave out and he collapsed to his back on the deck with a tired, satisfied groan, his entire body going limp as he just lay there, clicking softly and grinning from ear to ear (not that dolphins have much in the way of visible ears, but still), breathing like he'd just run a marathon. As he fell, his prick slipped out of Rebecca's mouth with a slurp, and she brought a hand up to her lips, taken off guard. As she'd suspected, she had _really_enjoyed that. Not as much as him, obviously, but as she savoured the taste of her brother's semen, one of her hands slid down her body, its fingers briefly slipping between her labia as she was overcome with arousal. She pulled them away when her twin managed to collect himself enough to speak. "...Oh man, Becky," he panted, chuckling tiredly to himself, "I'd definitely say that was one of the better ones, you should..." he swallowed, his mouth apparently dry, "...You should be proud of yourself." She smiled at him but said nothing, merely climbed up out of the tub on all fours and crawled the short distance to arrange herself above her brother's prone body. He glanced down his own torso, and following his gaze, Rebecca saw his penis, slowly deflating and gradually slipping back behind its protective slit. Looking back up into his sister's eyes, the other dolphin shrugged apologetically. "Sorry, Becky," he said, softly, "if you were hoping for a little cowgirl, I'm pretty sure it's out of the question for a while." She said nothing, just continued grinning at him. "...What?" he asked, mildly perplexed, "Cat got your tongue?"

Rebecca would have laughed if she could have opened her mouth, but instead she bent down, slowly enough to let Matthew realize she wanted to kiss him, and pressed her lips against his. His eyes started to flutter closed as he reached up to embrace her, only to snap back open, startled, as she casually revealed that she hadn't yet swallowed his come - by pushing it into his mouth with her tongue. Blushing, Matthew shuddered as he tasted his own sperm, though if anything this just lead to him kissing her more passionately, their tongues wrestling against each other, sharing Matthew's unique flavour between them, as their hands wandered each other's bodies. Bracing both of his hands on her back, Matthew playfully rolled over, pulling his feet out of the water, and pinned her against the deck, all without breaking the liplock they were sharing. Not one to be outdone, Rebecca reached up and grabbed her brother with her legs, then pushed against the deck with her muscular tail, rolling back on top with a triumphant look in her eyes. The twins continued to kiss until the flavourful seed had dissipated in their mouths, and finally broke off the smooch with a pair of warm smiles. Licking the end of his beak, Rebecca sat up and stretched, chuckling to herself. "Mmmmm..." she said, as if she'd just enjoyed a delicious meal, "I needed that." Below her, her lover laughed and smacked his lips, nodding his approval. "I second that," he said, "you kinky, kinky girl." Rebecca put on an offended face and gestured to herself in disbelief. "Moi? Kinky?" she replied, "Never!" "'She said, to the brother she'd just sucked off.'" Unable to keep a straight face any longer, she giggled, conceding the point. Getting up, she offered Matthew a hand and helped him to his feet, then leaned in for a much briefer kiss before they turned back to the hot tub. "Speaking of which," she said, giving him a sly look, "I think you have a job to do..." She stopped as his hand gripped her wrist, and enjoyed the look of lust in his eyes when she looked over her shoulder. "Oh, my, yes," he said, leering at her naked form, "and I know just the thing..."

Eager to even things up, Rebecca allowed herself to be lead back down into the tub, expecting Matthew to try her trick from earlier and eat her out under the water. It might not be all that original, but she would certainly relish the experience, and she didn't think she'd have any trouble keeping sharks out of her mind once his tongue was buried between her folds. But instead, Matthew sat back down in his usual spot, then gently pulled her down in front of him, sitting on the bench between his legs, and tilted her back to lean against his chest. She was pressed right back against him, which confirmed for her that his penis had entirely retracted inside his body; his pelvis felt just as smooth as hers for the moment. Matthew didn't waste any time; as soon as she was seated, his hands moved up to run along the front of her torso, making straight for her breasts, which he squeezed and kneaded softly as he kissed the side of her neck, whispering in her ear. "Might not have been obvious earlier," he murmured, "but I really had my heart set on giving you a good old-fashioned fingering, 'Becks. And I don't like to leave a job undone..." She shuddered against him and let out an ahhh as he focused on her nipples, which by now stuck out from her chest like thimbles, achingly hard and sensitive enough to elicit whimpers of need from the shapely dolphin. As Matthew's left hand remained behind, cupping a breast and squeezing at the soft flesh, his right abandoned her nipple and slowly, slowly slid down her belly, palm pressed flat against her skin, disappearing under the water almost immediately and requiring her to rely on touch alone to track its progress. Her breathing began to quicken the lower his fingers reached, and he chuckled softly behind her at how quickly she was reacting to his touch, laying kisses on her shoulder, neck, and cheek. Finally, Matthew's probing digits reached his sister's vulva, and the anticipation had worked her up so much that at the merest touch of his fingertips against her lips, Rebecca arched her back, throwing back her head with a moan. She realized that Matthew had anticipated this reaction; he'd moved his own head well out of the way of hers, as she was now resting upon his shoulder. She had more important things to focus on, though, like the fingers fluttering up and down her slit, which by this point felt so warm and needy that she was certain she was adding her juices to the mixture in the bubbling tub.

Jumping and whimpering at his slightest touch, Rebecca was soon clinging onto Matthew's other hand like a safety blanket, not entirely unlike the way she did when they were watching horror movies while cuddled up on the couch. She wasn't quite sure why, but she'd determined over the years that her labia were extraordinarily sensitive, almost as much if not more so than her clitoris. Although this meant she could get really worked up by accident if her underwear were too snug, which was kind of a drag if it happened in public, it also meant that she could often come just from penetration alone, making it easier to join her brother in climax at the end of lovemaking sessions. At the moment, though, both siblings were only focused on the fact that her sensitive lips also meant Matthew could turn her into a moaning, quivering mess with a single hand, and had in fact on past occasions had her completely at his mercy with the use of a single well-placed finger in her underwear. She was already trembling, biting her lip to keep from moaning out loud, and he was just rubbing her slit, he hadn't even pushed inside yet! "Ohhh... oh God, Matthew..." she whimpered in a shaky voice, "I... I..." Rebecca trailed off, realizing she wasn't sure what she had been going to say. Briefly moving his left hand under the water to press lightly on her stomach, Matthew encouraged her to relax her back, to lean back against him again, and then nuzzled against her cheek as his hand resumed its groping duties. "Shhhhh," he said, softly, "just relax and enjoy this, Becky, this is all about you." With that, he pushed his first two fingers between her lips and into her welcoming channel, the fleshy walls hot to the touch even amidst the heated water that flowed around them. Instead of vigorously thrusting into her, he gently rubbed and caressed her inner walls, going straight to her more sensitive spots and teasing his fingers against them, being rewarded by his sister's vagina clenching down on his fingers as if embracing an old friend. By now, Rebecca had her eyes tightly shut, better to savour each and every sensation, and she was twitching in her seat, groaning and gasping, on a fairly regular basis. The fingers outside her body continued to rub along her labia, occasionally reaching up to tease at her throbbing clit, all of it combining to make the dolphin begin to roll her hips, pushing back at the hand that was bringing her such pleasure, wanting more, needing more.

As Matthew continued his masterful work, Rebecca gasped, her toes curling up at the bottom of the tub, and reached back, placing her hand on the back of her brother's head in an attempt to embrace him from their awkward positioning. "Oh - Oh God, Matthew, c-could you move your f-finger back to the left?" she asked, trembling the whole time, "No, not that one, the one - yes! Oh_God_, yes, keep rubbing, k-keep rubbing, oh Matthew that's so good..." By this point, she was unabashedly thrusting her hips forward, humping against her brother's fingers to get more stimulation against her needy parts. Whimpering, she raised her free hand to the breast her brother wasn't currently teasing mercilessly, and began to squeeze and rub her nipple between her thumb and forefinger, turning herself on even more (which she might not have believed would even be possible ten seconds earlier). As she let out a shuddery ohhhhhhh, her lover chuckled and kissed her cheek. "What was that, 'Becks?" he asked, playfully, "You want me to keep you on the edge until you go crazy with need?" Moaning piteously, she clenched down on his fingers with her inner muscles, a feeling she knew turned him on, in hopes of discouraging him from this plan. "P-please, Matthew..." she whimpered, using her cutest voice, "N-no more teasing, I n-need it too badly this time..." Chuckling, her brother raised a hand from her chest to her face, softly caressing her cheek as he leaned in to kiss her on the opposite side. "Awww, you'd have to be a total jerk to turn down a request like that," he said, warmly, "You even said please. Well, let it never be said that I let down a girl in such dire need of release..."

True to his word, Matthew's fingers began to speed up, and with a strained yes, Rebecca resumed grinding against his hand, actually gasping when he returned to fondling her breast. To give herself something to do as she felt her orgasm building within her, the dolphin started trying to mirror his movements on the teat she was groping, though it was very hard to focus, and it only got harder and harder as her impending release got closer and closer, feeling like a bubble of energy growing inside her, getting ever closer to popping. "Ohh... Ohh... M-Matthew..." she whimpered, unable to stop trembling. She was close enough to Matthew emotionally that she knew she could trust him implicitly; it didn't even occur to her that he might leave her hanging on the very brink of orgasm as he'd playfully suggested, not after what he'd said. The shapely marine mammal closed her eyes again to ride out the end, and began to tense up all over as that ending hurtled towards her. She was expecting her lover to whisper something in her ear, something warm to make the moment magical, or kinky to make her come harder, but as her breath began to hitch and she stiffened against him, his only reaction was to lean in and kiss her softly, on the nape of her neck, and hold her even tighter against him. And that was it, as if he'd pressed a button with his lips and triggered her ecstasy. Rebecca cried out as her climax burst within her, and white-hot pleasure flooded her system, rushing outwards from her trembling, spasming vagina, which Matthew continued to rub and stroke, working his fingers along her sensitive labia and pushing past her collapsing inner walls to continue to massage her most sensitive regions, working as much pleasure out of her pussy as was possible. Maybe it was because of the freedom this isolated vacation spot gave them, maybe she was just feeling sexually charged today, but Rebecca was coming so hard this time, her limbs twitching and flexing at random, her tail slapping the water hard and sending droplets high into the air, that if her lover's arms hadn't been wrapped around her, she doubted she'd be able to stay in one spot for long. Even once her climax began to die down, and her parts entered the brief period of being over-sensitive, where stimulation was almost painful, she clenched her teeth and held out as long as she could, not wanting her brother's fingers to leave her body. Finally, with a noise that was somewhere between whimper and gasp, she reached down and grabbed his wrist, ending their fun. "Okay! Okay, Matthew, th-that's enough... God, that was so good..."

Rebecca gave her lover's fingers one last farewell squeeze with her tired vaginal walls before he reluctantly pulled his hand away from her cleft, and after pausing for a moment so she could push away just long enough to turn herself around and then settle down in his lap again, the siblings embraced, kissing and nuzzling and clicking and sharing in the warmth and happiness of Rebecca's afterglow. When a particularly long smooch ended, with Rebecca just leaning back to gaze into her twin's eyes, Matthew grinned in a way that made her heart go all a-flutter. "I love you, Becky," he said, softly, rubbing his hand along her back, letting his fingertips trail down the side of her fin, "There's no one else I'd rather have with me on this trip." It was now quite impossible for her not to smile just as widely as he was. She knew that, of course, he never had to say it, but at the same time, she never tired of hearing it out loud. "I love you too, Matthew," she breathed, holding him tighter, "always have, always will." The twins leaned in to kiss again, this one gentler, yet more tender than the ones before. Meant for the water, dolphins didn't have to worry about their skin pruning up if they stayed in too long, so the lovers remained right where they were, kissing and cuddling at a nice, relaxed pace, expressing their love in a less verbal fashion as the sky began to darken, the sun approaching the horizon. After a few minutes, Rebecca broke it off with a giggle, leaning back and looking down before remembering that she couldn't see anything through the frothy water. Reaching down, she groped around blindly and confirmed her suspicions; her brother's penis was emerging from its slit again. "Why hello there," she said, playfully, "I was starting to wonder when you'd come back out to play!" The twitching, gradually stiffening organ pulsed in her hand as Matthew's length continued to push out into the warm water, and she suspected he'd tensed a muscle or something to make it do that on purpose. "Mmmm, believe me," he said, just as playfully, "he's just as happy to see you." Continuing to lightly hold his shaft, Rebecca leaned back in and kissed him, enjoying the feeling of his prick growing bigger and stiffer in her hand, trying to resist the urge to stroke him. Somewhat counter-intuitively, once he was fully stiff, she not only broke off the kiss, she let go of his cock and pushed back with a giggle, floating over to the other side of the tub, her shapely buttocks coming to rest right where she'd been sitting in the first place. Leaning back, raising her arms to rest on the deck, she winked at him and crooked a finger, unable to beckon him over with the more sensual parts of her anatomy. "Well then, we could go back to talking for a while if you'd like," she said, "but you're raring to go again, I'm raring to go again, so why don't you come over here and make love to me instead, Matthew?" Not being an idiot, her brother silently chose the second option, and she giggled again as he grinned hungrily and followed her across the tub.

Matthew didn't immediately move in to embrace his lover, though he did lean in enough to nuzzle the side of his beak against hers. Rebecca lifted her arms from the wooden planks behind her and wordlessly took her brother's hands into her own, holding them loosely as his gaze ran along what he could see of her form, lingering on her pert breasts before moving up to her eyes. "So," he said, softly, "How do you want to do this? Can't quite manage it with you sitting down like that." Nodding her agreement, Rebecca pushed away from the seat with her muscular tail, and, struck by inspiration, braced the limb into the corner formed by the bench and the wall of the tub, letting her fins stick up through the surface. Otherwise supported by the water itself, she was now about halfway between standing up straight and floating on her back, and as she lifted her arms up to her brother's shoulders, he quickly picked up on her idea. "Mmmm," she said, wrapping her arms around him quite snugly, "I do love holding you tight. Reminds me that deep down, you're all mine." Matthew laughed softly and returned her embrace, holding her more loosely so he could run his hands up and down the smooth, soft contours of her back, and leaned in to kiss her. "Wouldn't have it any other way," he breathed, in the brief moment between that kiss and the next. Most guys - actually, almost all guys, really, would need to remove a hand from the shapely female's back, so he could take hold of himself and line his erection up properly for the main event. As he had previously demonstrated, thanks to his heritage, Matthew wasn't most guys. While he and his sister kissed with a slowly growing heat, a sense of urgency, his penis moved of its own accord, bumping around against the soft girl in its owner's arms to seek out its counterpart. Bracing his hands for a moment, Matthew gently lifted Rebecca somewhat, tilting his head back so they didn't have to break off the kiss, in order to help his penis into the proper angle to find his sister's heated slit, which would no doubt be drenched with her arousal by now if it weren't already submerged in water, making it impossible to tell. The head of his cock slid back and forth along her cleft, rubbing at those soft lips, swollen with desire for the deeds they'd already committed, and The Deed they were about to commit, that Rebecca actually began to wonder if he was teasing her on purpose. Just as she was about to ask him what he was up to, she felt his prick slide perfectly into place, ready to enter her with the slightest effort. Finally breaking off the kiss, Matthew looked into her eyes, the playfulness momentarily missing from his own, which only displayed a sense of love and an earnestness which made it clear that the question he was about to ask, the question he'd asked so many times before, was very important to him. "Becky..." he whispered, "Are you ready?" She shuddered in anticipation, and lifted her feet, which hadn't been touching the floor of the tub to begin with, and wrapped her legs around his waist, holding herself in position. That done, she nodded eagerly, excitedly. "Oh yes, Matthew," she said, "Oh, God yes!"

With that, Matthew eased her down, and both dolphins gasped sharply as those sensitive lips spread welcomingly, as the head of his penis pushed deep inside his sister's pussy, all the way to the hilt. Rebecca moaned unashamedly, squeezing her lover with all four of her limbs, so tight that for a moment he couldn't move his hips at all, not that he minded; some of their most intimate memories had begun with him simply buried inside her, not moving, the twins just holding each other close and savouring the sensations of their incestuous union. This time, though, the hunger within them both wouldn't allow such a sedate pace, and as soon as Rebecca's limbs relaxed, Matthew moved his hands down to her firm buttocks, holding her from beneath to support her, and began to thrust into her tight channel, letting out a groan of his own. "Oh, Becky..." he breathed, not intending, not needing, to say anything else. Rebecca shivered again in her lover's arms, feeling that beautiful cock thrusting into her energetically, rubbing along her inner walls, teasing her most pleasurable spots, and constantly stimulating those oh-so-sensitive labia she'd been blessed with, rubbing against them both on the in- and out-strokes. This time, though, their choice of location had brought its own curious twists to their lovemaking. Despite their species, they'd never actually done it with their parts submerged before, and feeling the water churning around and inside her vagina as her brother's prick relentlessly thrust into her tickled the cetacean girl on a level just as primal as the sight of the ocean, if a bit more stimulating. Whimpering wordlessly, she closed her eyes and just hung on, letting Matthew take control and simply losing herself to the sensations.

After a few minutes of energetic coupling, Rebecca clenched down on Matthew's prick just in time to feel the shaft throb with arousal, causing her lover to gasp out loud and tense up against her momentarily. "Oh shit, B-Becky..." he panted, "this is so good... k-kiss me!" Hardly one to turn down a plaintive request like that, Rebecca lifted her head from Matthew's chest, where she'd been burying her face to try and keep the noises to a minimum, and moved her hands up to the back of her soulmate's head to hold him steady as they kissed. If the smooches they'd shared before they began were hungry, this one was positively ravenous, the dolphins' tongues urgently pushing forth, wrestling against each other like it was the last time they'd ever kiss before the end of the world. Rebecca had begun to push her hips forward to meet her brother's thrusts, enjoying the sensation of his body pressing against her sensitive outer lips and clitoris, helping her along the path to climax. Not as much, admittedly, as when Matthew finally deployed her number one favourite use of his prehensile penis, which had taken them a lot of (enjoyable) practice to work out; he flexed it just enough to ensure that when he hilted himself in her tight channel, the head of his prick nudged at her G-spot, sending small waves of pleasure throughout her body on every thrust. Squeezing down tight, Rebecca shuddered, arching her back as she adjusted to this new pleasure. "Matthew!" she loudly moaned, past the point of caring how loud she was or what noises she made. Gasping, she recaptured her brother's mouth, twitching and shivering as he pushed her along towards what was shaping up to be an explosive release.

Again wanting it to last as long as possible, Rebecca fought the pleasure as long and as hard as she could, but eventually she knew she was soon to be overwhelmed, and clenched her teeth, composing herself long enough to speak coherently even as that beautiful cock continued pistoning into her, rubbing her inner walls exactly the way that most made her toes curl up. "M-Matthew... I can't - it's gonna..." she started, whimpering both in desire and frustration. Forcing a deep breath into her lungs, which just wanted to pant shallowly as her ecstasy approached, she tried again. "I'm g-gonna come, Matthew!" she gasped, "If you k-keep doing it that way, I'm gonna c-come so soon..." With a grunt, her brother slammed home extra hard, making her cry out as her lower lips pulsed with pleasure. "That's... oh God... that's the idea, s-sis," Matthew gasped, "I'm not g-gonna last much longer myself and I..." he trailed off with a strained moan, but Rebecca had known him long enough to fill in the blank; he wanted to make sure that she got off too. Nodding her understanding (and her approval), she kissed him again, ready to ride out the end.

In almost no time at all, Rebecca felt her brother stiffen against her, heard his breath catch in his throat - just as she toppled over the point of no return herself. The dolphin siblings broke off the kiss together as their orgasms consumed them, taking full advantage of the rare opportunity to cry out their pleasures as long and as loud as they needed to, knowing that in this isolated cabin, the only possible repercussions might be making some late-evening beachgoers deservedly jealous. Rebecca tightened her legs around her lover's waist as he slammed home one last time, hilting himself in her tight warmth, squeezing hard enough to prevent him from pulling out, wanting - no, needing him to empty himself within her. Not that he had any intention of doing otherwise, of course, he felt exactly the same way; pregnancy was not an issue between them, so they felt no fear in indulging themselves that way. Rebecca let out another tremulous moan as her vagina went into rhythmic spasms, her inner walls clenching and relaxing along her brother's rigid, spurting prick, her own waves of ecstasy extending her lover's climax, so that it really felt more like one, single explosion of pleasure, shared between two bodies. The water within and around her made it impossible for Rebecca to actually feel Matthew's pulsing erection filling her with his seed, but just the idea that it was happening, that her brother was making her his, made the dolphin girl come even harder.

There was a period of silence after their shared orgasm had died down, when the twins just held each other, their parts still locked together. There were no romantic words or intimate caresses, they just gazed into each other's eyes, breathing hard and fast, and smiled. For just a moment, they leaned in close again and hugged tight, and then they leaned back and, simultaneously, sighed in satisfaction. Glancing around them, Rebecca noticed first. "Huh," she said, "the Jacuzzi turned off." Indeed, the water was now relatively calm and still, now clear enough to let them see to the floor, only disturbed by the twins' movements. Matthew shrugged. "It's got a timer on it so you don't leave it on forever," he said, "I guess we managed to outlast it." Shaking her head, Rebecca giggled. "Figures it would be dolphins who would beat the clock." Glancing up, she realized that the sky was purple and the sun was finally setting. It had been late when she got home, but still, they'd been at this for a while now. Looking back at her lover, she saw without asking that Matthew had come to the same conclusion. Reluctantly, the siblings broke off their embrace, Rebecca lowering her legs first, supporting her own weight again, before Matthew pulled away, both of them shivering as his penis slid free; surrounded by her snug walls, he had barely softened at all, but now he immediately began to deflate, his manhood slowly retracting back into its pouch.

After brushing their bodies off in the water to make themselves more presentable, the twins climbed out of the tub, stretching and enjoying the cool evening breeze on their skin, which had been toasty warm for so long. With the trees surrounding the property, no one could see in, but they could just see the spot where the sun met the ocean from the corner of the deck. Rebecca was all set to linger for a moment, admiring the view, then retrieve her discarded clothes and head inside for the remainder of the evening - knowing their voracious sexual appetites, they'd probably do it again later, but while they 'recharged', maybe they could watch TV or look at kitten videos online or just cuddle - but just before she was going to leave that spot, she felt her brother's hand on her arm. Turning to face him, she saw that he was carrying the forgotten bottle of wine and the two glasses. He smiled softly and winked at her. "Champagne?" he asked, simply, though it was clear what he was really offering was company. Smiling back, she accepted one of the glasses, and once he'd put the bottle back down, she put her arm around his back, just holding him, feeling him return the gesture, another, much softer moment of intimate closeness as they watched the setting sun and shared a sparkling drink. "I love you, Matthew," she whispered, tilting her head to the side and resting it on his shoulder. "Love you too, Becky," he responded, holding out his glass, chuckling when she picked up on the invitation and clinked hers against it. Rebecca sighed contentedly and made efforts to savour this moment, standing naked with her lover and watching the sun set, as long as she could. She couldn't remember ever feeling secure enough in their privacy to go outside nude with her brother before, much less linger as long (and as loudly) as they had. When they went back home, they would have to go back to pretending, hiding the beautiful truth from almost everyone around them. But for now, on this isolated beach cabin, all that mattered was the moment, and the way they felt about each other. Oh yes, thought the young cetacean, hugging her lover a little tighter, we are definitely going to have to go on vacation again next year.