This is a true story, though the names have been changed to protect the innocent (and guilty).
Back in my college days I lived in a house(NOT a frat house) that had anywhere from seven to ten coed students living there every semester. In an effort to get caught up on credits I decided to go to a session of summer school, and the house only had five people staying there at the time, three guys and two girls.
One of the girls was Kathy, a very cute girl working on post-graduate classes who was a few years older than me. I would've been interested in her except for one thing—one of the other guys in the house, a good friend, really had the hots for her. I spent a lot of time counseling him on how to get her to go out with him, so the thought of me pursuing her was not an option.
Unfortunately, after a month of valiant pursuit it was pretty clear that my friend had no chance. I had become good friends with Kathy, and she made it pretty clear that she just wasn't interested in the guy. From time to time I even felt like she was interested in me, but I fought off the urge to pursue anything.
Anyway, as fate would have it, Kathy and I ended up alone together at the house for a weekend. Actually, I was going to be alone, but then at the last minute she changed her plans—in retrospect, I might've expected something was up.
So Friday afternoon comes along, and Kathy and I are shooting pool at the house pool table. I had become a pretty solid pool player over the years, and Kathy had not played much, so I was putting a pretty good beating on her. I can't remember exactly how it got started, but at some point we started joking about playing strip pool, where if you lose a game you lose an article of clothing, to be removed later. The whole time we were playing, it was just a big joke, and we were laughing and having a great time with it.
The funniest part was that I suddenly could not win a game. I'd run half the table and then scratch on the eight ball, or Kathy would come up with some crazy shot to win a game. When she won the first game I promised I'd take off my shirt later—thinking I would clearly win it back—and then I'd go double or nothing. Four or five unlucky games later, I had bet away all my clothes. I'll have to admit that at some point I started to get warm to the idea that I would be getting naked in front of Kathy. The exhibitionist in me was starting to not mind losing. At some point during my losing streak I had decided that I might just make it more than just a joke ...
So we get through the final double or nothing game—I think I scratched, on purpose—and we're having a good laugh about how she's won all my clothes, and I tell her I guess its time for me to pay up.
At this point, I'm fairly sure she was still joking about the whole thing, but when I suggest that we do the pay-ups in my bedroom, she was still laughing, but starting to wonder how far I'd go. At that point, I wasn't sure myself.
We walked into my room, laughing and joking, and I closed the door behind her and had her sit in a chair. By the time I had taken off my socks and shoes, you could feel the atmosphere change, from good-natured fun to nervous anticipation.
How far is he going to go, was what she was thinking; how far would she let me go, was what I was thinking.
We laughed and joked a little at this point, though I noticed her blushing, but she was still talking the talk, so I took it to the next level by removing my shirt, leaving me standing there in my shorts.
By this time in the summer I had a really good tan, and I could feel her eyes checking out my body even while she laughed and blushed again. Suddenly the whole scene had developed an erotic undertow, and even though she was trying to play it off with a laugh it was clear that there was more to it now than a joke.
After a while parading around in my shorts, I popped open the one and only button and partially pulled the zipper open, exposing my underwear underneath. By this time my college-aged cock was harder than granite, and she could probably make out the outline, all of which made it more erotic for me.