never mind guys, i found it
its called good younger boyfriend
oops, young good boyfriend it is bahahahh
you might also like this based on the plot you described:
these all have some age gaps but all wholesome and cute.
https://www.mangago.zone/read-manga/mitsuya_sensei_no_keikakuteki_na_edzuke/
https://www.mangago.zone/read-manga/ruby_red_wo_kamikudaku/
https://www.mangago.zone/read-manga/old_fashioned_cupcake/
thanks
guys is there any manga like shota oni.
but in ILLEGAL way. like, the older version plot like shota oni.
innocent adult and super optimistic younger lover. with age gap. the cool young lover who makes the adult fall for him with the lovey dovey route.
and please please please. i want it to be in illegal age alright. ty