Responses
This one? https://www.mangago.zone/read-manga/home_tsuyuki_yuruko/ (idk, if this is what you are asking for but, I find the age gap huge, but... shakes my head in * this witch of mine * )
Thanks a lot, but that's not it. This has pedo vibes
Do you know of a manga with a neighbour or something who knows the seme as a child and later gets together with him?
Seme also had a crush on the uke as a child, I think. But it wasn't grooming! So the uke just thought Seme was cute as a kid!