Grab the nearest gun
Literally “Daddy”
Very clean, might as well be a normal step dad - daughter relationship
https://www.mangago.zone/read-manga/jinbe/
More psychological than romance (no physicality so far)
https://www.mangago.zone/read-manga/welcome_home_papa/
No "step"s. Just full on.
https://www.mangago.zone/read-manga/fairy_gone_garden/
Bonuses:
Uncle x psycho niece
https://www.mangago.zone/read-manga/when_you_sleep/
Guy x daughter's friend
https://www.mangago.zone/read-manga/musume_no_tomodachi/
I want to read something related to a step dad and daughter trope