What to do in this situation?

Hmm well be careful. Is he sweet? Does he respect you? Trust me, I know JUST how you feel. It's so easy to get caught up! Umm I wouldn't suggest having sex though. It'd be best to be together at the time. Just don't go too far with him! Maybe when you're both a LITTLE tipsy, confess to him that you like him. Plus if he brings it up later.. And he doesn't feel the same, blame it on the alcohol! Haha good luck. <3