Everybody left for Spring Break except for me and Mike.
Not a great story, but completely true.
When I was at my frat a million years ago, everybody went home or someplace wonderful for Spring Break, but Mike and I were left alone at a small Midwestern university - no, really.
I had a big Playboy poster of a super-hot gal over my bed on the ceiling.
Mike and I were hangin', and I can't remember now how it went down, but I was talking about jacking and he was talking all kinds of nonsense about jacking off into a bottle and leaving it on one of the older guy's desks.
We ended up jacking together in my room with Mike in the chair facing my bed while I looked up at that poster, and I'd say it was a complete success, and a real bonding experience.
Shortly before that, I had an experience of being watched that I enjoyed - I had a roommate in my room of this frat, but the guy across the hall had a room all to himself... I went over to this second guy's room one morning and said, "I'm really horny and need to jack off, but my roommate is going to be getting back from class any second." This guy says, sure thing, so I go lay on the bed and start to prepare but HE DOESN'T LEAVE. I say, "Well, aren't you going to go somewhere else?" and he says, "Hey, this is my room, I'm not going anywhere."
So I just went ahead and did it there on his bed. I assume he liked it.