Christopher bobbed his head up and down the cock in front of him and thought about how long it had been since he had been able to stretch his out like that, let alone cum. Justin had decided that, since he couldn't have pretty girls, he should at least get to be a pretty girl, so on most nights Christopher dressed up in clothes lent to Justin by his girls and went around the dorms calling himself Krysti and building a reputation as the dirtiest slut in the school. To keep people from discovering his true gender, Christopher had to wear a diaper whenever he was Krysti, and explain to the boys that they don't want to go in there as Krysti never learned to use the toilet. Krysti, the dirty slut who couldn't even master potty training, only went down on boys and never let them take off clothes or give anything in return. Krysti only liked making men cum, saying things like "all real men deserve to get hard and cum whenever they want" and "real men's penises need to be able to feel good," further reinforcing his status as not a real man.
Krysti's targets weren't even popular boys, either. Justin had Christopher please the fattest, ugliest, most unpopular, and nerdiest boys on campus. He felt that Christopher needed to understand that even these people weren't as big of losers as he was, and that even they deserved to have pretty girls suck them off because even if they couldn't actually get real girls to do it, at least they weren't as big of losers as Christopher. Some days, Christopher would have to service up to ten men. It all started with one of Justin's girls worrying that her boyfriend would get jealous, so they came up with the solution of making sure the boyfriend got action on the side. Next, another one of Justin's girls was having her obese younger brother—still in high school—visit the college, and wanted to make sure he had a good time there. After this, it became a regular thing.
Christopher heard the boy moan and felt the cock twitch as he prepared to swallow the whole load. Justin tended to ask around about Krysti, and if he heard about lackluster blowjobs, behavior not befitting of a complete slut, or failing to swallow every drop, Christopher would be punished. Sometimes, Christopher spent time sucking their balls, licking their toes, or rimming their asses just to make sure he wouldn't get a bad report. This was especially common when they'd try to grab at his breasts, to which he'd learned to say "sorry, I'm just an a-cup, but let me make it up to you". The idea was that these boys should get to experience complete sexual satisfaction from time to time, while Christopher never deserved any sexual joy whatsoever. Sometimes, Christopher would even take the time to pleasure people beyond those Justin assigned, so that he could practice and try out new things without being punished for how he performed.