https://www.mangago.zone/read-manga/sayonara_alpha/ (omegaverse, super wholesome, nothing sexual until all characters are adults)
https://www.mangago.zone/read-manga/kouguu_no_omega/ (similar as above but with some nice plot points and growth)
https://www.mangago.zone/read-manga/kokoro_kanda_neko/ (regular BL, has a bunch of spin-offs, wholesome af)
https://www.mangago.zone/read-manga/harapeko_usagi_to_koisuru_ookami/ (same author as above, super silly and wholesome, normal BL, bunnies)
https://www.mangago.zone/read-manga/bye_bye_1/ (omegaverse, has angst and dark themes, good plot, character growth, yakuza-like top, surprisingly cute)
Hope this helps!
finally an age gap couple please if anyone has recommendations like this lmk!