There's another manga similar to this but the guy got blackmailed and became the JK pet and she take care of him cause he was tired of his black company life, it doesn't sound that bad actually wholesome too
Their relationship is honestly really nice! I love the fact that they both seem to enjoy spending time together. It's not like she's forcing him to go along with it.
Hopefully this keeps being fun and nice for a while longer and doesn't just force the "someone sees older guy with a highschool girl and starts stuff up" trope to happen.