A woman that f**cks a lot may be called a slut for this conversation... but a kid that does it to get a place to stay or whatever... is called being exploited. Because she's still a kid and still has a kids/teen mind and doesn't know better.
It does sound like she may have had some terrible memories but I'm hoping some things I've read on other comments show otherwise.
Officer: you're being placed under arrest for having sex with a minor. Statutory rape.
Person: but she consented.
Valid excuse just because she's a teen and looks mature enough or developed enough as an adult so you let the guys slide? What if she was 13 then? Or 10?
That excuse doesn't really work in most countries. It only makes sense to people that actually try to rape children.
Shes emotionally scarred and dependent seems she never had any healthy relationships in her life. And usually I don't mind romance building in these age gap type mangas but I hope it stays platonic and he serves as someone she can trust.