Manga, manhwa, manhua, or webtoon with a mature female lead. She can be workaholic, quiet, clever, independent.. traits that make the lead mature. 😳 And the male lead to be the submissive or dependent type(the male only depends on the girl)of course it's adorable if he's possessive too. Hmm.. I think a good example is Kimi wa Pet and The Descendant of the Dynasty. 😀 😃
It can be of any genre but not yuri/yaoi, obviously.

Definitely Stroke Material. The girl is a really serious student and the student council president, the guy is an ex-playboy (after meeting her). He is really submissive and possessive in a hilarious way.

I would suggest Sadistic Beauty, it's a webtoon and pretty much what you asked for. 😀 😀 😀
I totally loved it and I hope you will too.

Yeah, thanks. I've already read Stroke Material since long ago and I love Sadistic Beauty... still waiting for the updates, since it's ongoing 🙂

Really, thank you.

How about Horimiya?