I (18F) let my older brother's best friend fuck me in his car last night and I can't stop thinking about it

So this happened completely out of nowhere and I'm still kinda shaking from it. My brother had a few friends over yesterday, including this guy he's been friends with since high school who's like 24 now. I've always thought he was hot but never in a million years did I think anything would happen.

We were all hanging out in the basement, drinking a little, and I kept catching him staring at me.