...And Then It Happened...

I was at this party last night, just trying to stay out of the way. I had a couple drinks and ended up in the backyard with Sarah from my history class. We started talking... and then it went further. Next thing I know, we're making out against a tree. It felt wrong but amazing all at once. When she suggested going back inside for more...I stopped her. Did the right thing? Or should I have let go and gone with it? What would you have done?