Him & Him & Him
https://www.mangago.zone/read-manga/him_him_him/
Beta Count Has Changed
https://www.mangago.zone/read-manga/beta_count_so_has_changed/
Three Little Pigs (didn't personally like this one but I'll leave it here anyway)
https://www.mangago.zone/read-manga/three_little_pigs/
Manager ni natte mo mondainai (more than 4 ig, but all focused on one person)
https://www.mangago.zone/read-manga/manager_ni_natte_mo_mondainai/
Wait oops, the first one Him & Him & Him is NOT yaoi, sry I forgot
recommend me some 4P yaoi please