Wonder What They're Going To Do....

I think this was in September. My friends and I were all eating lunch, when we saw a couple pass by behind my Irish friend. She heard this:
Girl: So you'll come over to my house after school?
Boy: You got it babe. Can't wait. This is going to be fun.
I see them both kiss and then walk off. We all looked at each other, and my Irish friend was like," Did you hear that?! Holy s**t! Are you thinking what I'm thinking?" I shook my head and said," Maybe it's not what you think. Maybe they're going to.....do homework after school, or-or....play a game." My friend scoffed and said, "Yea right! They're going to do it after school. Goodness, you're so innocent." I slid into my chair. The couple didn't even look old enough. They looked like the Freshmen...or maybe they're Sophomores. I don't know, but we were wondering what they meant by meeting up after school to have some "fun."