Would she? I mean, can we even be sure they've had sex? Remember the comment she makes along the lines of "this is how it's supposed to be" when the MC gets hard during the guitar lesson? Maybe when things got intense with him and Sage nothing would happen and he'd make claims like he's "tired" or "not in the mood", so perhaps they've never had sex.
No problem with that. I get that it might seem daunting when you see the page numbers, but we're a welcoming bunch here and it's inevitable that new players like yourself might share a lot of the same theories that have been discussed at length already. So don't feel like you can't express your thoughts and theories because of that. We're quite happy to talk these things through again.