I can’t remember much of the plot but it was an omegaverse where the had 2 kids, one dark haired boy and one light haired baby girl
https://www.mangago.me/read-manga/percentage_of_love/
this is the only one i could think of
Nerd who fucks hard?
Under the green light
Love so pure is the only thing that comes to mind
Nerd project (except the author edged readers by putting the fucking part for the next season)
https://www.mangago.me/read-manga/nerd_project/