Heeeeeelp

for me, your description seems vague and a lot of mangas can fall under that. i know one manga but im not really sure about this cuz the seme is the younger brother and is blonde but here ya go: http://www.mangago.zone/read-manga/3_pun_instant_no_chinmoku/

Umm.. no.. the seme is elder brother, he's bussinessman and the uke still high school or college . They both a bit stupid.. the elder brother very obsessed with his lil bro . And one day he got angry and rape his lil bro (uke)

This - http://www.mangago.zone/read-manga/aniki_to_isshoja_nemurenai/

http://www.mangago.zone/read-manga/dear_crazy_monster/
This maybe?

Yessss yesss yesss.. this one
Thankyou so much

Not that one, but thankyou.. this quite good to read