Friend and I went to a New Years party at a bar with a few of his coworkers and their friends. There were DD's already set-up and we were all crashing at someone's house a few blocks away. As a social butterfly with no attention span I bounced around the bar all evening, chatting up anyone and everyone. As the night comes to a close I find myself talking with this girl, turns out she was there with my friends coworkers and was going to be staying with us all. My friend turns to me and says we are getting ready to leave and tosses me his car keys and asks me to start his car to get it warmed up. I ask her if she wants to help me warm up his car...she says okay and comes out with me. I start the car and turn the heat on, I look over and the passenger door is open and she's taking her jeans off in the parking lot and jumps in the backseat. "Well alright!" I follow her lead and we start having sex.

A couple minutes later the car doors open and it's my friend and his girlfriend getting in the front seat. The girlfriend makes some remark about how disgusting we are, my friend laughs and reaches back for a high five. She dismounts and the car ride to the house is awkward and silent.

We get out of the car (now with pants on) and I ask where the bathroom is. The girl says "I have to go after you, I'll follow you" and we proceed to pick up where we left off. As we were getting close to finishing my friends girlfriend (either completely oblivious or dumb) opens the door and walks in on us again. She makes another remark and slams the door shut...we both laugh...sex finishes and we proceed to head to bed (obviously with more sex throughout the night).

Never got her name and never heard from her again but that was definitely a randomly fun evening.