...that you can trigger a mutation in other people, by fucking them."

"And the effect is, that you, as the one who already has the mutation, can trigger a change in other people, by having sex with them."

"What? Do you mean, that everyone will grow tocks, like me?" You dimly remember from your implanted memories, how you went ill and after two weeks of agonizing oral pleasure, you had your huge penis grown inside your mouth. Your Mom and sister also grew them, and you were all completely freaked out until the first representative from ResQ came to your house. "They are going to mutate the whole dorm?"

"Relax your pussy!" Casey hisses. "You're going to wake up Ashley for no reason!" she waits a moment, massages your breasts and you huff out and swallow your anger like she demanded. Once you're relaxed under her ministrations, she continues. "So no, the trigger component is going to work different on everyone else. The ResQ researchers only expect small size effects, that are connected to the test subjects sexuality. Enhanced stamina or sensitivity, for example, and maybe a slight increase in genital sizes or libido."

"And for the trigger effect to work, the inoculated people need to have sex with someone who has the major mutagen. That means, us two." Casey concludes. "And that is why we are trying to trigger as many fellow students as possible, and why we are keeping records of how everyone reacts to being triggered." Casey considers for a moment. "ResQ of course figured out that they need to do the testing in a swimming dorm, because that allows us optimal oberservation in physical changes. Like, are people becoming more muscular, or do they gain weight... or lose it... all those side effects, you know?"

"So this is completely untested, and they just released it? And now the mutagen can spread to everyone?"

"Didn't you listen?" Casey argues, her voice clearly annoyed. "Only people who received the vaccines should have any effects. But sure, for good measure we should also fuck a few outsiders, not just people here from the dorm." she pauses for a moment. "Like... that would give us a totally good baseline reaction on non-inoculated people. So. Sure, why not. But the main task remains, you and me totally need to spread the mutagenic effect to everyone in the dorm. And all previous studies show, like, that only people who were exposed to the main mutagen, can trigger any effects in others."

You got the hint, now you want to learn what it means. "So. Like. You also took the mutagen. But you don't have a tock, now, do you?"

"Er, yes, I took the mutagen. But I'm like totally not brain-damaged and brushed my teeth with it!" Casey says. She turns you around to face you, and beams proudly. Then she reaches into the purple nightstand next to the bed, which is hers, and produces a small purple squeezing tube resembling your previous toothpaste. The tube looks about two thirds empty.

"The last two weeks, I massaged the creme into my tits. You may not have noticed while brushing your teeth, but the formula sinks in almost immediately."

Thinking about your memories, you do remember something to that effect. The toothpaste had somehow bonded with your saliva, and when you wanted to spit it out, it was always already gone, absorbed into the flesh of your mouth area. You know you never swallowed any of the paste, and just thought it was a neat side effect to the "new formula" that was on the advertisement.

You check Casey's breasts. They are not quite as large as your own, probably classified as C-cups. You think they have always been that size, but can't be sure. Not with your wildly scrambled memories of multiple realities. "Um... are they... like, bigger now?"

Casey grins. "Definitely. And they feel great on me! Like, muscles that I can flex."

To prove that, she bobs her left breast up a fraction, then her right breast. Then both together, in a rhythm that lets your tongue roll out of your mouth fully engorged. Casey is not shaking her goods, she's flexing. Wow. You bend closer to observe it. The underside of the swaying boobs seems to twitch when Casey flexes, and the large engorged nipples are twitching too.