I say you place a hidden camera in dorm to catch all the action. Just stock up a folder full of videos of your roommate jackin off. This is purely for fieldwork, of course.
The next step, collect all evidence. Old crusty socks, used condoms, kleenex in his garbage, whatever you can put your hands on. Keep it all in one box, close to your bed, for safekeeping.
Once you do all that legwork, the final step would be to catch him right in the act. While he's working out that forearm, ambush him from the bottom bunk like Charlie. Pull off those sheets and physically hold him down in case of any resistance. Hopefully, you can time all this as he's orgasming for the perfect climax to your lil adventure.
The proof is in the pudding, follow these simple steps and you're going to get him reaal good.
Also: I got a pair of those doctor gloves from the chemistry lab, put them on, and picked up some on the jizz wipes. They were stuck together. Meaning he definatly came into them. Also, there is an empty box of tissues on the floor by his desk. He is typing a paper now, but when he goes to the bathroom I will post a pic of the OTHER trashcan full of tissues and the empty box.
I asked him if he was sick or had a cold, and he said no.
roomate's thread somewhere else meanwhile:
"have this weird new roomate who accesses my laptop while im gone, goes through my history, and takes pictures of me and my jizz tissues"