Interesting....
https://www.mangago.me/read-manga/if_you_tell_me_to_do_it_i_ll_do_it/
This maybe? I don't know about the billiard ball into MC ass but it's kind of similar?
Not this one =[ indeed is similar
Sorry, then I really don't know(￣∇￣")
after 84 years I found it !! its this one https://www.mangago.me/read-manga/if_you_do_not_obey_me/ it happend on chapter 10 lmao. Story isnt great btw
I believe its a webtoon: Mc kinda seels himself to ML cause he needs to pay his father hospital bills or something (not sure). Main point is: there is a chapter where ML inserts a fucking billiard ball into MC ass. Mc is dark haired and ML blond I belive, Ty! lmao