DISCLAIMER: I do not endorse drug use, or using biological materials to get back at your jerk roommate for stealing food. In fact, it's almost certainly illegal, and a dick move anyway. Don't do it. Ever.

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I found a story in a deleted post on /r/ProRevenge, so take it with a grain of salt. Well, more like an entire salt pan.

Bunch of guys share a suite in college. They have their own fridges, and a common area fridge. One of them, P, keeps stealing everyone's stuff and blaming it on a certain controlled substance, including food, even if it's clearly labelled in the common fridge. The last straw was when he ate all of the home cooking they had, and left the containers in his room. So they took some frosted corn flakes and, ahem, frosted them.

Two days later, they see him walk out of the room, and the empty cereal box on the floor. He found out later that year and was "completely traumatized". And, presumably, switched to less potent happy tobaccy, because he never stole from them again.

So, I instantly had an idea how to make this into a TF scenario, as I often do*. Reduce it to four guys. Unbeknownst to them, one of them is infected by a werewolf, or were-hermaphrodite, or were-bimbo, or something, but they don't know it yet. So the thief eats the food and gets infected. They start to transform, and so does the infected person. And they, in turn, transform the rest of the roommates.

The logical extreme of this idea, and the one I'd probably write? All three dudes who frosted the flakes were infected, and the thief turns into some kind of combined creature. Some kind of werewolf hermaphrodite bimbo or something. The three infections mixed are all more potent, so he changes before the full moon is even up. And his powerful pheremones make each of them start changing too, and then they infect each other.

Maybe in different ways; the hermaphrodite person can infect the bimbo, but the bimbo can somehow only infect the werewolf, who affects the intersex person. Or something else needlessly complicated but more intersting than usual. If you don't like, ah, frosting, they can use dandruff or ground hair or bundle the cereal in sweaty socks or something else disgusting before putting it back.

Hang on, I need to retch. I'd like to remind you this sort of thing is wrong, probably illegal in real life, and might get you kicked out of your dorm or apartment. It would be much better to get evidence of the thief and his excuses and drug use, report him, and get him kicked out. I am not a lawyer.

Or you could write it with five dudes. Three infected, one thief, and one normal guy (or gal) who didn't participate and shows up as the POV character just as they're putting the bait back in the fridge. (Maybe it's even his first day there.) He sees them transform, then all four go for him.

The story ends when they wake up the next morning, in what's left of their clothes. And common area. (They are NOT going to get the deposit back.) One of them missed a date, another says they were supposed to finish a paper and darts for their room, and the third turns to the thief and says something like "are you going to stop stealing food now?"

"Are you kidding? That was the best night of my life?"

The third guy groans, and let his head flop back to the ground.

ENDF

* You should see the inside of my head when I pop into the local tool store.