I would bet dollars to doughnuts that at the start of the next school year, when boyfriend is far away at college, her first fuck will show up at her school as a teacher trainee. Problem solved.
@Donutlie He is. He's a third year, which is why they've made a few references regarding "this will be our last time doing [blank] as high schoolers." Personally I was originally under the impression that she was a year older, but as it turns out, that's not the case.