Chapter 2

Katherine whimpered as she felt her ass expand slightly, and she almost pulled off of Mike's hot member, but her desire to rid herself of her flat chest kept her on it and sucking. From Mike's position above her, he saw his test subject's jeans tighten slightly.

Mike stammered out, "Oh, god, Katherine ... you about to get your reward." His cock swelled. His face grimaced. Katherine could only grunt slightly as his member quivered and bulged in her mouth.

"Here ... it ... comes!!!" The hot seed jetted into her mouth. Mike rationed the first portion; he wished to study its effects slowly. Four hot jets flew from the swollen cock. It coated the insides of her mouth; it was sticky and to Katherine surprising sweet.

She moaned and sat up after the last jet slid down her throat. Mike's deflating member slipped out of her mouth and a slight drop of cum dripped on to her lip. Which she quickly licked up, she did not let any go to waste.

A short moment passed, and Katherine's stomach rumbled when the cum reached it, and her breasts began to grow warm and quivered slightly. It was as if her breast had given off a small hiccup. They swelled up a little over a cup size to a large C cup, pert and full, and began to pull her formerly loose sweater taut. Katherine moaned sexily at the sensation of swelling and looked to Mike. "What ... what just happened ... why did my butt swell ... what ... what did you do to me?!?!"

Mike stated simply, "I told you, 'the biggest ass has the dirtiest mouth.'" He proceeded to flop himself down onto the couch. "And you said..."

"P ... p ... pe ... pe ... cock," she struggled at the word again.

"Now watch." Mike instructed. He began rubbing his hands together in anticipation, grinning wide. Katherine gasped as a feeling of warmth washed over her and flowed into her ass, leaving it more swollen. The distinct sound of clothes stretching could be heard, but it did not last long. The jeans held up under the strain.

"But ... how ... why can't I say..." She began to panic as the sheer impossibility of the situation washed over her.

"Katherine, I think you should calm down."

She calmed down noticeably and in a fleeting show of resistance began to put her hair back up in its scrunchy. "It's ... it's just so strange..." she says.

"I know." says Mike, playing along.

Katherine sat on the couch next to him. She admired her new breasts, but she could only enjoy it for a moment. Then that pang, that familiar feeling of shame came over her. She could have sworn they'd be bigger for some reason. Katherine looked down at her chest and frowned slightly. They still seemed so small to her. She thought to herself, I was flat before, but these are more like an A cups. She bit her lower lip as her eyes fell back on Mike's dick and she thought of what just happened.

"Thinking of something in particular, Katherine?" Mike asked.

She blushed again. "Maybe..."

Her hands ran over his shoulders and down his sides. She bit her lower lip harder as her eyes fell back on his magical tool again.

"They'll be more that later." Mike said as he zipped up his jeans and stuffed his penis back into his pants. "We should get back to studying don't you think?"

Katherine gave a sexy pout as he zipped up, but her mind returned to her previous duties and the extra credit she was supposed to earn. "You're right ... we still need to get you to pass that test."

Katherine picked the textbook back up off the coffee table and tried to find the spot where they left off. As they went over the problems, it seemed more like they're doing them as an assignment together rather than Katherine providing tutelage. While attempting to explain what little she still remembered of the co-efficient of friction, Katherine absentmindedly rubbed the underside of one of her breasts.

"So, yeah. Plugging that in should be the answer." Mike said as he noticed her breast touching and he began to wonder just how horny she had become. He had totally forgotten how much of the serums he had given to her. A little more won't hurt, so he got up to get her another glass of the arousal water, "Thirsty?"

Katherine was lost in thought. Each problem seemed more vexing than the last. As they continued doing problems together, she kept stroking at the underside of her breast, feeling the fabric as it slid across her skin. She squirmed slightly on the couch, her tightening panties digging into her hips. Katherine smacked her lips at the suggestion, "Please ... I'm parched."

Mike delivered the water to her and asked, "Katherine, I think you want to tell me the dirtiest sex act you've ever done." Mike waited patiently for her dirty mouth to flow freely and thus, change her more.

Katherine, with slight beads of sweat forming on her brow, thankfully took the glass from him and drank a quarter of it in one gulp. "Dirtiest sex act? That's a funny question."

"You know what I mean. Something like, have you ever taken a penis in your buttocks?" Not often had Mike heard someone attempt to speak while avoiding all slang. It sounded strange.

"Well actually..." she started. "There was this one time that Craig and I were at the park ... and he was felling kinda frisky..."

"Frisky?" Mike looked saddened by her completely June Cleaver way of describing arousal.

She continued, "So we went behind some bushes and after I sucked him off I let him stick his cock in my ass. He fucking went at my rosebud for a little while and then came all over my backside. It was pretty fucking hot."

Mike stared in anticipation. He counted four words of penalty. Katherine let out a moan as waves of energy flowed out form her pussy and into her ass. The previously loose pants pulled very tight and showed off her enhanced posterior and her bulging lower lips. This elicited an even larger moan from between her upper ones.

"My God, Katherine, your rear!" Mike exclaimed in delight and his member swelled at her plight.

Her jeans showed remarkable resistance. She bent over and grasped at her rear with her hands. She squeezed her cheeks. This brought a soft coo from her lips. It felt so wonderful to her. Her eyes caught Mike's swelling member and it drew her immediate attention.

"Think you could tell me the science of that?" he smirked commenting on her recent growth.

"Science..." she growled lustily, "That can't be science ... You made me say that didn't you!?!"

"Made you say something, that's ridiculous." He continued, "That makes no sense at all."

Her panties bunched in her slit. She moaned and pawed at her crotch a little. She tried to pull them out of her crevice but failed miserably. This activity only excited her more in the effort. She would have to live with the camel toe created by her panties and jeans.

"Oo ... g-gawd..." She tried in vain to unbutton her pants, their tightness gave her great difficulty. The pulling of the denim against her lips only made things worse and the fabric grew dark with her arousal.

"Katherine, did you..." He pointed to the dark spot, "have an accident?"

"N ... no." She grimaced as her fingers clumsily tried to undo the button, but with a slick coating of sweat they only slipped off.

"That's okay. Just leave them, it's a leather couch," Mike stated calmly. His thoughts drifted to the absolute elation that would come when her soft skin tore through the denim.

Katherine made a face as she sat down on the couch. The leather cushioning and her jeans creaked. Her lips bulged noticeably against the front of her jeans, and the smell of sex was clear in the air. Mike inhaled deeply and smiled. He began to talk to her about the status of their studying, but through her arousal she only caught the last two words, " ... Extra credit?"

Katherine moaned at the sound of those magical words, confusing the studying with accomplishing her transformations. She ran her tongue over her lips and finished off the rest of the glass of water in front of her. As the drug laced water hit her system, she slouched back in the couch and stared at the ceiling; her hips bucked a little as she did so.

"Hey, you try to figure out problem 10, I'm gonna get some fruit to munch on." Mike went off to the kitchen to get the next in his series of his experiments.

"Uh ... okaaaay," She leaned forward and picked up the pencil, and was finally able to hold on to it after dropping it numerous times. She wasn't anywhere this clumsy? Was she?

Mike returned with a bowl of strawberries. He observed Katherine outlining the problem, making slow progress at something that she would have known nearly instantly before.

"Oh! Strawberries! Those look delicious!" Katherine exclaimed.

"Eat up. I read somewhere they have the ability to help cognitive thought." He added mumbling, "And also dye your head a sensual red." Mike thought of how inspired it was to make that cupcake a universal receptor for all the future changes he would perform.

"Mmm ... thank you." The glittering berries distracted her from her near madding arousal ... mostly. She took a bite of the strawberry, savored it as she chewed at it. With each bite her eyebrows lightened slightly until they were the red matched the bowl of fruit in front of her.

Mike pondered about the sparse hair on her moist, hidden clam. He thought to himself, I'd just die to munch on a red carpet. That will definitely be something I can scratch off my bucket list.

Katherine worked her way through the berries, her ponytail grew lighter and lighter. Eventually it took on the same red hue as her eyebrows. And, coincidentally enough, her hair smelled faintly of strawberries.

While she ate, she rubbed her hips against the couch, trying for a little stimulation to curb her growing arousal. "Wow ... those were really good berries, Mike. You must have gotten a great batch."

Mike replied, "Best in the store I guess". A strand of hair fell in front of her face.

Her mouth opened into a wide 'O' as she saw the hair fall in front of her eyes, "My hair ... it's ... red?" She pulled a few more strands out into the light, "And so silky ... what's ... how did that happen?"

"You didn't dye it before you got here?" He was trying to keep her stuck in lie as long as possible.

She looked confused for a moment as she stroked some silken locks, "Yeah, I guess I did ... I felt like it was time for a change you know." Her hand rubbed at the underside of her breast again before sliding down to the front of her jeans.

Snapping them both back to reality, Mike said, "You know we should probably turn the page soon?"

Katherine felt immediately embarrassed knowing she hadn't helped Mike much at all. "S ... sorry..." She blushed deeply at the realization that she was not making much progress. With a jittering hand she turned the page, tearing it slightly in the process.

"Oh, sorry again ... I'm just so clumsy today."

Katherine tried to look at the next problem, but her eyes kept drifting to Mike's crotch. The arousal water she had consumed earlier began to take a stranglehold of her reason and body. Every slight movement was pressure on sensitive body parts.

"Katherine ... you are so usually together" Mike said while closing his book in front of her face. Katherine did not even notice this overt act. Her mind only held a small hold to the idea of studying. Her brain told her that there was much more important things to do.