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Fur sprouted all over Darren's body as Jen began to lick her lips. There was a scent in the air. And her soon to be big bad wolf of a boyfriend was where it was coming from. His dick, already rock hard began to surge, the base widening into a knot. He grunted as his chest rippled, muscles growing again and again as he stepped forward. His ankle's switched the way they bend with a crunch, as his tail shot out to balance him. His hips became better suited for leaning forward ever so slightly, and his muzzle shot out, fangs filling his mouth. "So," He growled, "Does the cute little elf like what she sees?" He took a step forward towards Jen, mouth now permanently agape, he finger slipping through her slick folds, the other hand tweaking her left nipple. After a few seconds, she whimpered, and gave a quick nod.

Darren pushed her onto her back. Her hand, still playing with herself now rubs faster, as her hips begin to buck. "We can't have you finishing so soon, can we?" He asks her, tauntingly. She shakes her head again, and with no small amount of willpower, she moves her hand away from her clit, and grabs a piece of the sheet instead. Darren grabs her, and takes great care in moving her to the edge of the bed, his thing and strong paws grabbing her thighs and keeping them apart. He was much stronger like this he realized. Though he lacked a certain amount of dexterity, he made up for it in brute force.

He held Jen to the bed, a single massive paw resting in the crevice between her two succulent breasts. "Don't move. I want to....test something". He had always enjoyed going down on Jen. Getting to hold her where he wanted her, position her so that she was in JUST the right spot for him. And then lick her until she couldn't take it any longer. He used his other hand to spread her legs, or rather finish as Jen quickly got the idea. He put his muzzle at her entrance. He inhaled her needy scent. She wanted, no, needed him. He reached his head up, his gray fur being the only thing Jen could see over the rise of her breasts. And then, he flicked his tongue experimentally over her clit.

"UUUUUNNNNGGGGG.....GOD!" She screamed as the pleasure washed over her. Her body, only slightly enhanced from the serum, shook with pleasure. She could feel everything, his breath, the coldness of his nose, the roughness of his tongue, everything. And she convulsed under him. Another lick sent her closer to the edge. A third sent her completely over it. She shook, her entire body convulsing, her hand shaking along with the rest of her. As she rode out her orgasm, Darren's tongue sped up, increasing in speed again and again. This continued on for the better part of ten minutes. To Jen, that was ten years. Her final orgasm was the most intense, triggered by Darren's long wolf tongue penetrating her folds. She screamed silently, and squirted all over his surprised face. After that, he let her go, twitches still running through her occasionally. "I, Uh, I, Uh........... wow...... holy...... yeah...... good....." was all she was able to utter. Two minutes later she was able to sit up. She saw Darren's massive member still staring her in the face.

"Welcome back to reality." Darren said with a sly grin. He stepped towards the bed, still hard member just out of her reach "What do you say I get my turn, and we let my tongue take a rest?" he said with a smirk. She nodded, and spread her legs once again. Darren positioned his member in between her legs. He looked her in the eye with a "ready?" in his eyes. She nodded. He pushed forward slowly, filling her. He howled as he did this, filling the room with an unnatural air. Jen screamed again. After filling her completely, Darren slowly pulled his hips back. Jen's fingers grasped at the bedding, turning white with tension, her entire lower body feeling full to the brim. Well past her breaking point, Jen came again on the now monster cock that was inside of her.

After allowing her to come down from her high, Darren began to pull out, slowly. Jen's walls must have become tighter when she took the Acclimator. He slid in again as she began to convulse underneath him, and began a steady pace, her body twitching again and again, in rhythm with his thrusts. Her arms flailed above her. Darren bent his head down and ran his tongue over one of her nipples, sending a twitching throughout her body. And then he began to feel it. His know was swelling. He pushed harder and harder to get it into her. She convulsed again and again, her mind gone and replaced by bliss. With one final heroic push, he slammed it into her, her lips absorbing the knot. Two barely half thrusts later, Darren howled as he painted her insides with his seed, and she bent up and grabbed his fur, holding him close to her. They rode their orgasms together, until finally Darren's subsided. He crashed to the bed beside her, his knot still holding them together.

The bed creaked and groaned under Darren's new weight, but the solid, reinforced bed frame still held together. Darren was the first to speak this time, as Jen was still in a trance of sorts. "So, that was fun. Like a lot of fun." He said, smiling. Jen looked up at him and smiled, nodding. Her eyes were beginning to uncloud, and he knot was beginning to shrink. After ten more minutes of cuddling, they both untangled themselves, Darren's seed running down Jen's leg. Darren stood up and admired himself in the mirror. Now standing in at over 7 feet tall, he would have had to duck to avoid hitting his head on the ceiling, if he wasn't stuck permanently hunched over. His member, now retreated back into what he could only call a sheath was a good 9 inches. His yellow eyes staring back at him and his long muzzle were bug two of the addition to his face, one that resembled a wolf more than his own. A shock of brown head fur was the only thing that reminded him of his humanity. He smiled as he looked at Jen, on the bed trying to get her legs to stop shaking "I'll grab us some water." He said as he left the room.

On the kitchen table, there were still a huge number of products left to try. Darren took a look at some of the options. "Master of the Night" looked fun, as did "Cat scratch fever". "Heroes from above" seemed like it might be fun, but he wasn't sure about how it would feel to be an angel. Another box of "Wolf's Howl" was in the mix. Darren grabbed the two glasses and was about to leave before he remembered something. He set a glass down, put it under his arm, and joined Jen in the bedroom.

Jen sat on the bed, admiring herself in the mirror. She loved how she looked. Like a princess. She put her hand to her elongated ear and had to repress a squeal of joy. This was her. This was real. When Darren opened the door, he knocked her out of her stupor. She turned to him, and wrapped her arms around him. "Hey wolfy." She said with a smile, giving him a kiss on the nose. Darren held her tight for a second and then let her go. He handed her a glass of water, as he struggles with his own. After a few embarrassing tries, he finally decided to lap at the water like he'd seen the family dog do many times before. She laughed at him, and gave him a kiss when he was done. A few minutes of cuddling later, and after basking in the feeling of his fur on her naked skin, Jen sat up, looking at a large black bottle on the nightstand.

"What's that? Demon juice?" She asked as she reached for it. She held it in her hands, reading the label.

"Yeah. It's supposed to increase the power of any transformation. We have a lot of it, so I thought it might be fun to...." Darren started before Jen had already opened the bottle. She filled the small black cap with the juice and knocked it back Darren sighed. She'd at least read the instructions. He grabbed the bottle from her as she began to tremble. At least her impulsiveness would be fun.

Jen began to feel her body resizing again. He skin went from her slight tan to pale, and her muscles rippled. Her hair grew another foot, until it was down to her hips, which like the rest of her body became more slender, and her breasts even shrinking slightly. Marks began to show on her skin, a series of purple and black tattoos that covered a good section of her body. Her eyes became more perceptive, able to see nuances in colours they never had before, and her skull reshaped slightly to accommodate this change. Her hands became dainty, and her form became graceful. To Jen, this all felt like one big orgasm. "HNNNNGGGHHH" she cried as she writhed on the bed, and her breathing, once quick and shallow, slowed to a manageable pace. She stood up and looked down at herself. Her muscles tensed, and as she looked around the room, everything Darren did seem to be slow motion. She laughed, her musical laugh filing the room. She looked down at herself, lifting one of her breasts to test the weight. She smiled. "Wow. This is perfect. I feel, great! You HAVE to try this!" She handed him the bottle.

Darren grabbed it in his paw. His girlfriend was right: if Jen had THIS much fun imagine what he'd do! He tipped the bottle and the liquid went down is throat. It burned a little, and it finally settled in his gut. He began to swell. Everywhere. His body, his legs, his head, his penis. He felt good, really really good. And then it hit him He felt his mouth fill with saliva, and then his claws thicken and his teeth grow. Jen looked at him strangely, like she didn't expect this to happen. He grew a foot, and his fur grew shaggier. And then he looked at Jen. And smiled. "So, do you like your big bad wolf?"

Jen took a step back on the bed. All she could smell was him. How good would it feel to have him inside of her? And how badly she wanted him to keep her down on the bed and fuck her until she couldn't take it anymore. "Oh yes," she says with a devilish grin, "I like my wolf a lot." She lounged back on the bed; her legs spread waiting for him to come to her. Darren smiled and flipped her over with one hand, getting on the bed behind her. His added weight caused the bed to creak slightly. "What are you doing?' Jen asked curiously.

Darren grabbed his member and held it to her opening "we're going to do this in a ways that's more...appropriate." He thrust into her in one quick almost brutal motion. This wasn't just having sex anymore. He needed to have his fill. Jen groaned under him, her arms starting to give out and only some pillows he was able to grab kept her from collapsing entirely. Darren kept thrusting harder and harder, Jen's moans filling the room. He felt his know grow in, as he shoved it harder and harder into Jen.

"What....What is thaaaAAAAAATTTTTT!!!!!!!" Jen asked as he shoved it in her. It was bigger than before and it almost didn't fit but it finally slipped inside of her. Jen couldn't move. Talking, thinking, breathing, they all caused waves of pleasure to spread through her. A few thrusts from Darren later, and they both came, Darren filling Jen up again with his seed. As they came down from their orgasms, they both flopped over and passed out, the world slowly fading as they drifted off to sleep.