https://www.mangago.me/read-manga/the_double_life_of_the_demon_king/ (has a lot of nipple play if my memories dont betray me, and mc has tiddies the size of mount everest)
idk if it’s good or not but off the top of my head the two bls i know with nipple play are:
- https://www.mangago.me/read-manga/beefy_boom_anthology_a_friend_s_tiddies_are_a_burden_to_an_otaku/
- https://www.mangago.me/read-manga/hugpai/
and both fall under the category of childhood friend to lovers with nipple development?????

Im getting my period so please recommend me yaoi with really dang good nipple play