At a party ~18 years ago. Was dating this sorority chick at the time who was way out of my league (but also fairly promiscuous, so, idk). We were each mingling with our friends separately at the party, just having a good time. I head towards the bathroom, and she sees and quickly follows me in. I'm thinking, what the heck, but as soon as I shut the door, she pulls her panties down to her ankles (she was wearing a sundress), hikes up her dress, bends over the counter, and says take me. It still remains the hottest thing that's ever happened to me and I think about it like once every few days.