So I'm looking for some yaoi manga with a specific setup where basically one of the guys (preferably the seme but uke is also fine) decides at a young age of around 11 or something that he's going to be with a certain guy who's older than him, like highschool age or even older. They don't actually end up getting together till the younger one is older but the kid never gives up.

If you guys have some recommendations that would be really great. Bonus points if it actually shows the kid growing up and trying at different ages being persistent . ^-^
Anything is fine except incest and them having sex before the kid is atleast 16.

I think puchi puri is what you are looking for. Heres the link 😁

https://www.mangaupdates.com/series.html?id=30239