I lived in a single dorm in college while my girlfriend at the time was attending a nearby college. My girlfriend Lisa was a freshman that year, a year younger than me. She is beautiful, about 5'7" with beautiful full 36D breasts with large pink areolas and hard nipples when she was aroused, beautiful hips, and since this was the early 1980s a nice full light brown bush that matched her hair.
Lisa and I had been together for four years and for as young as we were, we were very experienced sexually. We had often discussed fantasies and one of the main fantasies we had was to have a threesome with a guy with a large cock. She was very turned on by huge cocks after seeing some porn that featured a model with a huge penis.
That day was a late spring day in a northern state, warm and bright, and after a long winter, it felt like liberation. Lisa had to travel with her college band for a jazz concert and was gone for most of Saturday. While she was gone, a friend of mine from high school and I got together and we spent the evening bar hopping the various college bars around the dorm block. We had to head back to my dorm around midnight because Lisa was going to meet me there when she got back from the concert and spend the night.
So we got back to the dorm and had another drink or two from the vodka I had in my room. Lisa got there around 12:30 am and came up to the room. Now, the fact is that Lisa had been attracted to my friend for quite some time, including making out with him once in high school which was in some ways a prelude to this night. When she got to my room my friend was lying in my bed, a bit tired from a night out drinking.
Lisa and I talked a bit about the day, then somehow we got to the subject of our fantasy. We started to get a bit excited about actually turning the fantasy into reality. So we decided on a plan. I was going to leave the room for a while and then come back in 10-15 minutes. Lisa was wearing a pink tank top and jeans, but before I left I removed her bra, leaving her breasts accessible. I looked back as I left and her nipples were so erect underneath the light fabric.
I could not believe that we were actually doing this. My adrenalin was pumping so much I could feel the nervousness in the pit of my stomach. My girlfriend was in a room with another man. The minutes seemed like hours. I walked to the bathroom. I went down to the lobby to check my dorm mailbox. I went back to my floor, but then down to the lobby again. The entire time the sexual tension was unbearable as I imagined what they were doing in the room.
I finally went back up the elevator to my floor, walked past my door once, and then back. I used my key (we still had physical keys in those days) and stepped into my room. I could see my bed from the door. My friend was lying on the bed with the tip of his cock sticking out of his pants meaning she obviously took him in her mouth while I was gone. Lisa was kneeling on the floor, her tank top off and breasts exposed, and she was in the motion of taking off his shirt.