Just read Re:Marina, liked it quite a bit. Looking for something similar.

For clarity, I wanted a super aggressive / affectionate, but somewhat mature female. Not just an airhead, and also preferably not just randomly obsessed with MC.
Prefer a MC who's not super perverted, but also not just ignorant / uninterested, just awkward or such that takes a bit to warm up to her.
No Harem, NTR or tragic endings pls. Borderline H is ok. Not really looking for straight Hentai, but if it's a decent length series you recommend, sure.

Not particularly similar, but other series I've enjoyed include Sakuranbo Syndrome, Nozoki Ana and Velvet Kiss.

Thanks.

Henkoi! - Maybe you will like this?