Kai, a Freshman in High School, Is 20 Years Old. 4

Kai Sugawara (my crush) and I are in the same grade at school, but he's always seemed much more cool and mature. One night, I see him sitting at a bar with some adults... Is he drinking even though he's underage...?! I'm worried about him, but he says, "I'm 20." ...What?! In return for keeping his secret, he kisses me!!! What am I going to do? How will I face him tomorrow...?!