This feels a little weird.
It reminds me of how female prostitutes often find themselves playing a therapist for their male clientele, because the male clientele feel like sex will solve something.
Similarly, the girl here seems to think that sex and losing her virginity will solve something, and the MC is then put into the therapist role.
However, the difference is that the prostitute is doing business for the sex (not the therapy, that's external to the sex) even if she feels like sex might not be the answer to the client's issues.
Compare this to our MC; he isn't doing business, therefore it feels a little strange that he's indulging in the sex whilst kinda knowing that it really isn't the real answer to anything the girl is feeling and internally contending with.
I get that this is supposed to be a porn story, and isn't really meant to be a story about helping the girls he has sex with, but I just feel like analysing this will get that weird feeling of my chest - that the MC isn't necessarily going about this the right way at the moment.
I get what you're saying and agree to a point. However, it's not that deep. The sex isn't a transaction, but a release, a relief, and possibly a boost of confidence. It also got her to relax a bit more around him, so she can really go into the root of the problem (bratty boy).
After indulging in this hedonism, it probably gave her just enough confidence to not put up with bratty's shit. Just think of the MC as a wondering samurai that solves people's problems with his sword. Which happens to be his penis. The most effective way to solve people's problems? Probably not. Still works, though.
Honestly, after reading some of the novel, I'd wish this was all the series was. I normally don't mind world building and depth, but it is
completely out of place, depressing, and weird here. I'm really wishing this one time they get creative and selective in the adaptation. Like that porter one.