Looking for a manga with a guy who teases a girl and gets her worked up in an “innocent” way or he smiles when teasing her. He could be a low-key sadist or someone who plays around with the girl but smiles when doing it so he looks innocent.

An example could be

Boku no Ie ni Oide

Thanks in advance!

Shishunki no Iron Maiden

Jishou Akuyaku Reijou na Konyakusha no Kansatsu Kiroku sounds like it's right up your alley! 🙂