amber alert is exactly this!
https://www.mangago.zone/read-manga/amber_alert/
also my hyungs omega (unless u dont like omegaverse)
https://www.mangago.zone/read-manga/my_brother_s_omega_yaoi/
haven (also omegaverse)
https://www.mangago.zone/read-manga/haven/
dear teddy bear but uke lowk a pushover
https://www.mangago.zone/read-manga/dear_teddy_bear/
and you are so lovely
https://www.mangago.zone/read-manga/you_are_so_lovely/
my half baked esper too but it is a bit short
https://www.mangago.zone/read-manga/my_half_esper/

mc is older than ml. mc took care of ml when he was young (ml when younger either outcasted or have issues etc) ml gets possessive of mc since young to old.
some examples. regas, approximal guide, tree without roots, follow the breadcrumbs, Sincerely: i Became a Duke’s Maid
some examples are of straight romance but i would like recs for bls w similar troupe
thanks yall