Look up stuff by Onoko ya Honpo/Kamiwo Akira (bl) and Umekoppe (straight) on either b*to or h*ntaifox
Extreme/you might find gross (expect triggering content):
https://www.mangago.me/read-manga/boss_you_ve_worked_hard/
https://www.mangago.me/read-manga/puppy_play_with_papa/
https://www.mangago.me/read-manga/a_crown_of_thorns/
Our lord and savior Ppatta:
https://www.mangago.me/r/l_search/?name=Ppatta
(Slightly) More normal:
https://www.mangago.me/read-manga/handsome_sales_department_is_the_ideal_master_01/
https://www.mangago.me/read-manga/handsome_sales_department_is_the_ideal_master_02/
https://www.mangago.me/read-manga/club_renew_housoushitsu_wa_yari_heya_the_broadcasting_fuck_room_eng/
https://www.mangago.me/read-manga/serve_get_thrusted_and_beg_for_love/
https://www.mangago.me/read-manga/koi_suru_bicchi_no_toro_ana_jijou/
https://www.mangago.me/read-manga/shugo_tte_akuryou_ojisan/
https://www.mangago.me/read-manga/illicit_bromance/
https://www.mangago.me/read-manga/suezen_ni_kiss/
These are the smuttiest that I've seen, but if you want more I recommend anything on my favorites with smut mentioned (I like more extreme smut):
https://www.mangago.me/home/mangalist/370254/
And this album is nice to cruise through:
https://www.mangago.me/home/album/72763/
wtf ur the goat thank yew
ooh sounds cool, thanks!
give me the most depraved smut you have pretty please