Maybe..a man who can't say no??
all bl here.
3 people:
https://www.mangago.me/read-manga/help_me_teacher/
https://www.mangago.me/read-manga/triangle_lovers/
1 vs multiple:
https://www.mangago.me/read-manga/barracks_bunny_eng/
heres what i've read, all bl tho
https://www.mangago.me/read-manga/hanamaru_manga_inkya_na_ga_futago_boku_ni_aisareru_iyau/
https://www.mangago.me/read-manga/there_s_no_way_this_is_fate/
https://www.mangago.me/read-manga/one_two_three_1/
https://www.mangago.me/read-manga/i_a_kept_man_am_the_pet_of_two_high_spec_men/
straight smut or yaoi where the fl/bottom gets fucked by 2 or more men consensually (bonus if it has scenes where the fl/bottom gets fucked in the mouth and ass/pussy simultaneously)