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Issei was the first one to wake up the next morning, having tossed and turned throughout the night last night. Waking up, he saw that Rias was still next to him, sleeping gently, her belly slightly swollen with leftover seed and that the rest had soaked the entirety of her bed. Trotting over to her pussy, he went to check on the little glowing crest that was on her last night, and didn’t see anything. Her skin had gone back to silky smooth white, the only abnormality was her bulging belly full of doggy cum. Interested in her situation, Issei started to investigate, sniffing around her and also seeing if he could summon the voice that talked into his head to explain the situation to him again. Hey that was pretty smart of him.

“More than what meets the eye aren’t I?” He said excitedly. He paused for a moment. “Holy shit, I can talk like a human now.” He blinked for a moment too. “Also what are all these colors, I never seen this color on a person before.” Issei looked over to Rias’s crimson hair and sniffed it. “Still smells the same.” He pawed at her sleeping face a few times, slowly waking up the exhausted girl.

Rias slowly opened up her eyes, blinking slowly as she saw her newest pet and peerage member.

“Good morning Issei.”

“Good morning Rias.”

The lady stared in shock at what her dog had just said. “You can talk?”

“Yup.”

“Since when?”

“Since we fucked last night.” Issei’s eyes wandered down to his mistress's breast which had a light sheen from the drool he dripped onto them last night. He could feel that his balls started to ache a bit as more spunk was being made.

“But how did you learn how to speak after that?” Rias stood up now, her tits shaking around side to side before she was off the bed. She stumbled a bit as her belly made her feel unsteady, but there wasn’t any more cum loss either. Issei enjoyed the view of her firm and well shaped ass licking his chops as he watched her. His gaze did not go unnoticed by his King.

“Like what you see boy?” Rias said, turning her head to look at her naughty peerage member.

Issei started a bit longer till he noted that Rias spoke to him. “Um, yes. Wait, what did you ask me?”

Rias giggled at her dog’s confusion. “Nothing important. But seriously, what taught you how to talk?”

“I don’t know Rias,” the mutt’s tail and head lowered, disappointed that they couldn’t give a good answer, “I was just having a good time with you when a voice in my head told me to try harder. After that, I remembered some lights and me saying goodnight to you. That’s it.”

“Wait, you heard a voice in your head?” Rias started to connect some dots in her head, and a hypothesis was being formed.

“Yeah, she asked what I was waiting for when I was trying to get my knot inside of you and gave me a boost.” His cock was starting to poke out of his sheath again, and it was slowly rising as he thought about last night.

“I-I see.” Rias stuttered a bit as she noticed the dick rising for her, the crimson princess’s attention starting to drift to more carnal matters. As got closer to Issei, a dull ache began to take over her, and she felt like there was something that needed to go back in her.

“What do you think about that Rias?” Issei asked, wagging his tail side to side as his foot long bitch breaker stood at full ready and attention.

“I think that I need to take care of this first.” Rias kneeled in front of the bed, making herself eye level with the knot, taking the cock in one hand and tapping it against her right cheek. Issei eyed her happily and let her do her own thing, knowing that he was soon going to be in good hands. Rias then grabbed his dick with her other hand, massaging the base of his knot, making Issei whine in pleasure as his meat was being gently tenderized. Even though Rias was starting to feel more and more cock drunk as she worshiped the shaft with her tongue, she paid attention to any form of magical flairs or activations on her or the dog. Soon, she felt the aching in her womb grow, prompting her to put a hand on her mound, feeling the slight surge of power over her. Looking down, there was a small red heart, about the size of her thumb above her snatch. Trying to get to the bottom of it, Rias slipped her mouth around the doggy cock and licked the tip of it, swirling her tongue around it to moisten the top. Her mouth started to descend upon the thick piece of meat, her throat trying to open up to accept it.

“Ah, you're doing great Rias,” Issei piped up, glad that his King was treating her Pawn so well. Wanting to help her task out more, he put a paw on her head. She gave him a look, but nodded to let him continue, so he put a second paw on her head and started to push down on her crimson red hair. She bobbed her head up and down, stopping half way down, only able to take the top half of his shaft for now. He felt like she could take deeper before, like how she was able to take more last night. Pushing harder, Rias started to gag and gurgle, struggling to take more dog meat down her gullet. Not wanting to hurt her, the dog let up, allowing her to go back up to just lick at the tip with her tongue. Issei wished that he could thrust up to get more of himself down her mouth but he was pleasantly surprised when the princess wrapped her arms around his back and propelled herself forward, pushing her jaw, tongue, and throat to the limit as she went down almost all the way to the knot before being unable to go any deeper, gagging so hard, her teeth started to gnaw at his dick, which he didn’t mind all that much since it brought a new sensation to his cock. She slid off weakly, having lost her breath, the bitch breaker proving too large for her little mouth for now. Coughing, she tried to speak.

“Issei, I need you to fuck me.” Wiping her mouth, she spread herself eagle on the carpet, fingering herself with the precum and spit that she collected.

“Absolutely ready,” he hopped off the bed and jumped onto the ground, his cock harder than ever from the sloppy toppy that he had received. Circling around her, he gave her a few licks on the cheek before Rias went deeper and gave him a french kiss, slipping his tongue into her mouth, enjoying the way that she was being completely filled again. Her cunt was getting wetter too, and she felt ready to take her whole dog now. She slapped her pussy a bit to get his attention which he interpreted to lick her down there.

“Ahhh, as much as I enjoy your tongue down there, I am more than wet enough to take you right now. Also take a look at this.” She patted his head to get the dog’s attention and pointed at the small unfilled red heart right above her pussy. “You did that.”

He came in closer to sniff and look at the heart. “It smells kind of like me.”

“Like you marked me huh.”

“Well, not fully yet.” The dog smirked a bit. “Want me to?” His tail wagged back and forth.

“Sure why not,” the crimson princess not yet knowing the implications.

Excitedly the dog starts to pace around his master, before pointing his rod at her legs first. A stream of yellowish pee came out, covering her milky things before travelling up to spray on her pussy.

“That tickles a bit, ha, but it feels kind of nice too.” Rias commented.

“Ahhhh, still going,” Issei said as he traveled up her stomach over her navel, before shooting his mark on her tits. He gave extra attention there, rubbing his cock between her giant mounds, enjoying the boobjob as he marked her face at the same time. Rias tasted the salty liquid, and found it to her taste. It was soaking into her cherished crimson hair too, but she was too engrossed in doggy cock to care.

“Mark me as yours Issei, that’s a good boy.”

“Hah, I think that’s everything.” The dog sighed as his stream ended with him firmly between his master’s tits. This didn’t stop her from caressing his mounds with her heavenly feeling breast, nor did it stop the dog from humping her valley. His cock barely peaked between them, a testament to both of their massive organs.

“Oooooh, getting closer are ya?” The crimson princess moved her tips up, jerking the dog forward so that she could raise her mouth to swirl her tongue around his doggy tip, just barely stimulating him with her tongue. Pre-cum was lapped up quickly, light moans coming out of her mouth as she enjoyed the taste of doggy pre. The brown fur mutt could only quiver as he tried to push deeper between her tits, enjoying the light sensation at the end as her mouth breathed upon his end. His knot couldn’t fit inside between her breasts since it was so large, so she was in complete control of the pace. That was till a voice started to speak in the dog’s mind.

“OH COME ON, THE BITCH IS MARKED AS YOURS ALREADY, JUST CLAIM HER ALREADY!” The strong female voice ran in the dog’s mind. Issei tried to thrust harder but the soft sensation from Rias’s tits and the way that she looked at him affectionately made him pause for a moment. Just a moment.

Leaping forward, Rias could only send out a muffled wa as Issei shoved the rest of his cock into her maw, nearly choking the girl before he stopped with his knot pushed up against her face, giving her some time to stop panicking and learn to breath through her nose. With her air flow under control again, Issei started up the pace, face fucking his bitch into the ground of the carpetted floor, her bobbing her head a bit to keep frenching the knot at the ned, but it wasn’t going to be enough till she was making out with his balls. Rias seemed to agree with this because she soon closed her eyes to focus on just the doggy dick thrust into her, his scent marked all around her and in her nose. Her mouth was nowhere normally wide enough to take the knot though, and unless some magical source helped them out to push through her sore lips, there was no way that the lady could take the entire thing. Fortunately for them, they had a little buff coming in.

“BOOST!”

A voice in Issei’s head rang out again, suddenly doubling his thrusting force, allowing him, shove his knot right past her teeth and fill her mouth completely. Rias’s face hurt from the sudden intrusion, but she could barely feel any of that as the dog started to shoot his massive load straight into her stomach, blocking out her throat completely as it was filled with sticky doggy cum. There was no escape as her insides were filled up by white cream, Issei still humping her face as she squeezed her lips around his knot, her teeth lightly massaging it to keep it pumping her full. Her spit couldn’t come out of her mouth due to how tightly sealed the knot kept everything, so she had to learn how to swallow with a doggy dick completely filling her esophagus. Rias’s belly bulged a bit as the stream of jizz entered her mouth. She felt incredibly hungry for some reason, and the spunk tasted divine, so why not partake. Her breath slowed as she could only think about servicing her Pawn, and the fact that she just had a full breakfast with all the spunk being poured in her. There was no real indication that she had just swallowed nearly a quart of good doggy stock, except for a little inflation on her tight looking stomach. Issei soon started to tug backwards, trying to get his flesh out of Rias, and she helped him out by stretching her mouth as wide as possible and pushing back. Issei ended up spraying the rest of her face and a lot of her hair with his cum, painting her in white all over.

“Haaa, haaa,” the crimson princess could only pant as she tried to adjust to the pain that her jaw was in and grab some air. Her dog tried to help out by kissing her on the lips, swirling his tongue in her overloaded mouth. She tried to weakly return the kiss, but his tongue basically just bullied her into the back of her own mouth before dragging on her chin to start sucking on her tits. Each one got a love bite, right on the areolas, making her arch her back in pain and pleasure as it left teeth marks around each one. The dog had other plans though before he was finished. Having experienced cumming with his King already, he wasn’t going to be tuckered out with one go.

Rias summoned a magic circle by her aching lips and one appeared by Issei’s ear. A telepathic message played out in his mind. “Can you please grab me that Phoenix Tear in the bedside drawer?” Her hazy gaze fell onto the spot with the Tear.

Issei got up and approached the nightstand, pulling on the handle with his teeth and yoinking it open. Getting on the bed, he looked inside and saw a few odd items, but he figured that the item needed was one of the vials of red liquid. Taking one in his mouth, he brought it over to Rias who drank it.

“Ah, that’s better.” She adjusted her healed jaw, and turned towards Issei, “Now, ready to continue?”

“Hell yeah!” The perverted dog said excitedly. He was already feeling the effects of blue balls due to all the waiting he had to do, and couldn’t wait to pound his bitch into the ground like last night.

“Ok, let me get into position first,” Rias said as she turned over, getting into a low doggystyle, shaking her fine ass side to side to entice her man. Issei loved where this was going and shoved his snout into her wet snatch, rubbing his nose right into it to memorize the scent forever.

“Ah, Issei, you naughty boy, you are really getting a good whiff of me aren’t ya?” She cooed as she rubbed his nose into her snatch up and down.

“Hmmmm, you just smell so good, and I want to be able to remember this scent wherever I go.” Issei started to lick up the dripping pussy juices as Rias got wetter from the sensation of her dog rubbing his face against her muff. “Taste too of course,” he said as he wiggled his tongue deeper inside of her.

“Take as much time as you want, I love what you are doing.” Rias leaned forward, her tits flat to the ground as she reached behind herself to spread her cheeks to give her pet easier access. Trying to remember, Issei wondered if he ever checked her health. Thus he moved his nose upwards to check on her asshole.

“Hey, what are you doing back there?!” Rias said worryingly when she felt the tongue slide between her ass crack. She didn’t really hate the feeling, but it did surprise her and sent a shock down her spine.

“I didn’t get to check your health yesterday and I want to memorize your musk here too, one sec.” Issei said, putting his nose right into her puckered star. He swirled it around a little bit, his mouth panting into her cunt. She tried her best to stay still as he explored her rear end, his hot breath tickling her. Stifling a moan, scooted away and twerked her ass for the dog.

“Issei, I need you now,” she whined trying to get the dog to stop leading her down a strange path and just fuck her. Not wanting to make her wait any longer, he slapped his meat on her ass cheeks with a large smack. Her butt laid still as he put his hind legs on her back, prodding her waiting hole with his cock before trying to shove everything in one go, hilting at 10 inches, prodding right against her cervix bashing in for entry. Rias whelped with pain and pleasure, her belly taking in the shape of the mutt meat inside of her again. She rocked her hips back against her lover as best as she could, trying to get those last two inches inside of her. She wasn’t built for it yet, but she would damn well try to get as much doggy dick inside of her as possible. Issei was feeling her efforts and was rewarding each of her thrust back with one forward of his own, pushing his pelvis up against hers to try to knot her up again. Her body wasn’t letting him go deeper though, so he had to come with a plan. Looking within, he called on the voice in his head.

“Hey lady, mind helping me out a little,” the dog thought in his mind.

“I AM NOT JUST SOME LADY, I AM A DRAGON!!!” The voice in his head yelled at him, making him jolt forward, missing stride and poking right into Rias’s cervix.

“AH! Right there Issei, push it right into me. Make me feel just like last night.”

“Getting there, ha, Rias.” The dog said before continuing his humps, wrapping his front paws around the girl’s waist as best as he could.

“Come on lady dragon, help me out here,” the dog begged. His thrusts were slowing down, trying to focus on the voices in his head, and Rias noticed.

“Come on, Issei, you got this, don’t make me wait,” Rias slowed down herself, almost pulling herself off completely except for the tip which she teased by swinging her hips side to side. Issei had to close his eyes to focus on the dragon lady instead of not being able to knot his King.

“See, she’s begging for it too now. Can you please, please do the thing you did last night? That burst thing?” He continued to beg.

“IT IS BOOST YOU FOOL! AND I MUST CONSERVE MY ENERGY FOR IT IS SO FAINT NOW!” There was a short pause, “BUT FINE, CLAIMING THIS BITCH MAY INCREASE MY POWER IF DONE RIGHT.” Another pause, Issei was starting to tap his hind legs and whine in impatience while Rias started turning around to see if he was ok. “FINE, FINISH CLAIMING THIS BITCH, AND FIND MORE.”

“You got it boss.” Issei said out loud, forgetting to keep things in his head.

“Boss, I prefer princes or, wait, what’s going on!?”

“BOOOST!” A sudden surge of red and green light started to appear around Issei’s cock, brighter than before, and the veiny structure seemed to grow inside, a solid two inches, making the bitch breaker even longer and a bit wider at the knot. It also came crashing down into Rias’s womb all in one go, shoving her face forward and flattening her tits as Issei took that surge of power to get completely off the floor and push her all the way down. He was now riding her with legs off the ground, but his thrust hitting twice as hard with half the control. They started pounding into the girl with heavy strikes into her cervix, making her scream out his name as her little tight hole inside finally gave way to the savage beast, shoving four inches of doggy cock meat into her womb.

“Iiissseeeeeei, oh Satan, right there, fuck me in the baby room! Where no other man has been before!” She yelled with abandon, her stomach completely deformed by the dick poking into her now, a bulge in her belly showed where the tip of his cock was, stretching her out. Issei was now mindlessly prodding his cock with shallow thrust into her forbidden chamber, rearranging it so that it would be easier to accept him from now on, whenever he wanted, her inner hole changed forever to be able to take a doggy cock. Whenever he wanted, whenever she desired him. That hole was now stretched out forever to take the tip and shaft, her womb a vessel for cum. The short thrusts were taking their toll, the womb pussy squeezing tighter than ever as it welcomed its new master, with the rest of her cunt milking his shaft for all that he was worth. The heart shape marking on Rias’s belly was glowing now, with the same light that was rearranging her insides to take so much more than before. None of that matter though since Issei still hadn’t gotten his knot in yet, since it had swelled in size again, not getting past her sopping pussy lips.

Issei was filled with determination though, and even without the lady in his head pushing him forward, he still would have gone all the way just to hear his lady keep screaming his name. With that, he pushed as deep as he could in, plowing Rias’s ass straight into the ground, not letting any room for escape. Rubbing the edge of the knot up against her lips, he swayed it from side to side, putting more and more power into pushing through her limits, make her take that knot, and with the fading energy from the BOOST before, he shoved it past her outer walls, invading deep inside her, getting his four inch knot straight into her cooch, reshaping it again.

“Oh Satan, oh Satan, it’s in me agggaaainnn, aaaaahhhh,” she screamed as her whole was stretched beyond any reason that it should, the mark over her womb growing larger as it grew to six inches, which was the same amount of cock meat currently thrusting inside of her baby room. The knot had sealed the dog into the girl, but that doesn’t mean that he wasn’t still pulling her along, teasing her inner labia by taking half of the knot out before shoving the four inch bulge back in. Her cunt couldn’t close properly anymore, and could now take even the huge ball going in and out of her. That didn’t mean that she wasn’t tight though. Every time that his tim rammed into the end of her womb, she gave a vice grip too he pulled back, sliding along her cervix and inner walls which were completely slick with her juices and his pre. Rias was struggling to remain conscious as her reasoning was being destroyed by the massive amount of mutt inside of her. That was until her body couldn’t take it any more and loosened its grip on Issei, making her slide off of him slowly. The dog was too tired and distracted to care as his prey fell off his meat. Looking inside, her os made a few quivering kissing motions as it attempted to close, barely able to go back to a mockery of her original shape. With the line up ready, he rocketed right into her womb, knot pushing past her opening ,and came right inside of her again, filling up her insides with what could have been a gallon of beastly sperm, invading all of her insides and making her let out a silent scream as half a foot of thick, doggy meat went deep into her end zone. The heart glowing over her womb filled up as well, but nobody took notice as the little six inch thing exploded into little sparkles till a much smaller and detailed heart design appeared, back to the original size of last night, barely larger than two inches. The ex-stray was still swirlling around inside as he gyrated his hips, trying to enjoy the sensation of over fucking his bitch, making her belly swell with his seed as he continued to fill up her insides. The crimson haired bitch could barely hold on and just moaned as her body was used like a good fleshlight. Her stomach swelled so that if someone were to just take a glance at her, they would have thought that she was filled with puppies. Fortunately she was enjoying every moment of being destroyed on the inside, and if she could, she would do everything in her power to get the ball rolling again.

A part of him knew that she wasn’t going to be getting his pups anytime soon, but he didn’t care. Issei had done something no man had done before, which was fuck Rias Gremory into submission using just their wang. And he wasn’t done yet. With new found power comes new found responsibility, and that responsibility required him to fuck her until she passed the fuck out. Even as he felt the embers of his power and growth dying out, his cock shrinking back to a foot long, that meant that he could just try to go as deep as possible into Rias. His second wind was now taking full effect. Issei started to toy with her pussy again.

“Hah, hah, hah, what are you doing now boy?” Rias asked as she tried to recollect herself and felt Issei start to shift behind her, getting his legs on the ground again instead of on her.

“Yes, yes, another round? I’m ready, ahh,” Rias tried to lift her own hips, but they proved useless since she couldn’t get the strength to go any higher. “Maybe, give me a moment?”

“Hhhhah, fine, I can, ha, wait.” Issei said, getting some of his control back. He was coming down from his high, and he knew that Rias would be ready for another round in a moment. To occupy himself, the dog flipped Rias over and laid on top of her full belly to start playing with her giant tits gently while rubbing his cock against her bloated belly which was leaking cum out of her engorged opening. It was almost wholesome and soothing if Issei grew much more impatient overtime, making him start to manhandle her tits while the cum continued to drip out of Rias. That and the fact that Issei had started to hump her tits while he was waiting. His tailhole was right in Rias’s line of sight and her pants for air were starting to tickle his balls as she looked up to her Pawn that was tit fucking her. Taking in his musk made her feel light headed, but ready for more. Him humping also made his beady sweat more and the position brought more of his scent out.

“Huh, Issei is right, people do want to smell other’s butts.” She shook that thought from her head though to focus on more important matters.

“Hay, hey Issei, I think that I’m ready to keep going,” the crimson haired princess said, rubbing her cum filled and soaked belly. There was a sudden ring as Rias’s phone rang. Issei’s ears pricked up and he trotted over to the phone and grabbed it for her, unfortunately slobbering over it but at least the phone didn’t crack.

Looking over the screen, Rias frowned. “Oh fuck.”

---

“So this is our newest peerage member, Issei.” Rias had dressed herself in a thick pair of sweatpants and sweatshirt, used a spell to help clear out the spell, and told Issei to lay on her bed. “Say hello to the rest of your peerage members, Issei,” the crimson princess said nervously.

The lady had also put a thick pad underneath her crotch and expelled as much of the cum as possible into another pad before getting rid of it with her Power Of Destruction. Unfortunately she couldn’t sit down and look cool like she wanted because when she sat down, a large stinging sensation with no pleasure, made her welp, and piss herself. Thus she needed a new change of sweat clothing. So now she was introducing the dog like a game show host giving it her all to Akeno and Koneko. Akeno wore her usual unreadable smile while Koneko looked at the dog disappointedly. Actually, she was standing at the bedroom door as far away from the dog as possible.

“So, I am not disappointed but, why … Issei.” Akeno was trying to figure out why her King chose this creature specifically and Koneko was just looking at the panting dog on the bed.

“Cause I believe that this dog has a Sacred gear that can help us out in the future, and my Evil Piece reacted to him.”

“There is no way that a mutt could have a Sacred Gear. Only humans and their descendants can have those.” Koneko said, annoyed that her King was even considering this.

“Whoa that sounds cool, what’s a Sacred Gear?” Issei piped up, too excited to focus and wanting to join in on the conversation.

“The dog can talk!?” Koneko shouted, getting closer to the bed. Rias raised an arm in front of her mate while Akeno stayed quiet, directing her full attention to the dog now.

“Yup,” Issei said, wagging his tail and starting to get up, Rias put a hand on his head to pet him and keep him on the bed. She had a feeling like his boner wasn’t completely gone yet. “And I have a lady in my head that talks to me sometimes too.”

“See, he isn’t just a random dog.” Rias said excitedly. “We finally have another person for our peerage, and I feel like this is a turning point in our lives.” She tried to quickly move but stumbled a bit before righting herself. Akeno slightly caught her King and helped her stand up again.

“Are you ok Rias?” concern clear in her voice.

“I’m fine, I just had a rough night last night in the rain. I tried finding the angel that killed our newest member but I couldn’t find her.”

“Oh, I know where she is.” Issei barked up.

“Wait what!?” Rias asked back.