My dad has this cabin we like to go to on the weekends. Sometimes my parents will bring their friends, other times I get to bring my friends. This past weekend was my dad's 52nd birthday so we planned a trip with the family and a couple of his closest friends. On the Saturday night, we all got really drunk. We were watching movies and playing pool in the basement. One by one, everyone went to sleep until it was just me and my dad's friend (who was watching tv). I always get super horny when I drink and knew I had too many, so I got up to go to bed. As usual, I went over and gave him a hug good night. Ended up tipping over and falling onto his leg ... 'by accident'.... so that I was straddling his thigh, still hugging him. Feeling him pressed up against me like that I couldn't help myself, I started rocking back and forth on his thigh in my thin little Pjs. We didn't say a word, just hugged while I ground my pussy on him again and again. Hearing him breathe heavy and loud in my ear just turned me on more and before I knew it, I was riding him so hard you could hear my ass clapping with each bounce. After I came, I stood up and noticed a wet stain on his leg going up from his knee. I just went right to bed. The next day, he wore those jeans to lunch and I saw my pussy stain still on them. Got to come to the cabin more often