I'm more into vanilla stuff but,
https://www.mangago.me/read-manga/punch_drunk_love/ uke is so kinky here i love it
https://www.mangago.me/read-manga/dawn_of_the_dragon/ has a good smut on s1, I kept rereading it when it first came out.
https://www.mangago.me/read-manga/the_boss_in_the_bedroom/ (very kinky)
https://www.mangago.me/read-manga/bdsm_basics_guide/ (green flags and kinky)
https://www.mangago.me/read-manga/river_of_bondage/ (Seme gets kinda weird and annoying near the later chaps)
https://www.mangago.me/read-manga/yian_s_binding_yaoi/ (Basically just r@pe w/ BDSM)
https://www.mangago.me/read-manga/hit_me/ (Rape w/ BDSM)
https://www.mangago.me/read-manga/the_double_life_of_the_demon_king/ (Kinky)

What's the kinkiest, impossible, yaoi you can think of?