I'm looking for romances where the male is a bit gruff (more reserved in his affection) and gentlemanly towards the female.

The female ends up being the one to pursue the male lead and take things to the next level 'cause she wants him to return her affections and squee~

Best example is Kamine Takeru from the Tsurezure Children - Kamine Takeru /Gouda Ayaka.

But not immature and surly like Uchikai Makuzu from Kore wa Koi no Hanashi (at times he was more of a brat than the younger girl taking care of him!) - Chika (the artist)'s male leads are all like this.

sensei! if i remember right.