My first and only threesome took place during my junior year in college. I did not have a girlfriend but my roommate, Mark, was dating a girl named Susan. They met at the university dining center where they both worked. They had been dating for a few months and seemed pretty happy.
Since they have been going out they kept trying to set me up with one of her friends. I kept refusing because I was so focused on my grades. I tended to spend most of my time studying, usually in the campus library so Mark and Susan could be alone when she came over in the evenings. I knew they had sex when I was gone but pretended not to notice when I would get back.
Isolating myself like this did result in good grades but it also resulted in me being terribly horny. Naturally I masturbated a lot. As much as I could anyway with a roommate who never seemed to leave. One time he left to take a shower at the communal bathroom down the hall. He usually took long showers so I thought I would take the time to relieve the ever present pressure in my balls.
My roommate my freshman year had introduced me to erotica and I had been hooked ever since. I still got off to pictures and movies but erotica was, and still is, my favorite. I found a good story and was going at it when Mark came back! It did not seem like he had been gone that long but there I was, fumbling to get my pants back on as I heard his key in the door.
I was not quite fast enough. When he entered he saw me standing there with my pants on but opened. He had a surprised look on his face and then looked down.
But then he smiled when he looked back up and said, "Okay. Sorry. I guess I'll go back to the shower for a minute." I tried to explain that I wasn't doing anything and that was not necessary. I never was a good liar. Especially this time since after he left I looked down and saw the top of my erection sticking out of my briefs and realized what he saw when he looked down.
I was too embarrassed to finish so I just finished getting dressed and went to the library as usual. He made a crack about it the next day but then never said anything about it afterward.
A couple of weeks later I was preparing to head out to the library again when Mark was telling me that Susan thought I was cute. He said she was coming over and maybe I could stick around tonight, for a while anyway. I mumbled something about having a lot of studying to do and declined. Just as I was about to leave Susan came in.
She smiled and said, "Hi, Steve! Oh, are you leaving? I just got here."
I said, "Yeah, I got a lot of work to finish for a paper that's due next week. Maybe some other time."
I left and began walking downstairs. Just as I was walking out the door I realized I had forgotten one my textbooks. I turned around and went back upstairs to our dorm room. I unlocked the door and walked in. Susan had a surprised look on her face and had frozen with her denim shorts halfway down her legs. Mark was sitting in front of her on the couch with his shirt off.
