I forgot this name of a manga, I only remember a little, the only things I remember is that one of the main characters had really big biddies and worked at a book store.
This is what you are looking for http://www.mangago.me/read-manga/charming_scarface/
There was this one bl manga I was reading and I forgot the name , the main character had black hair and had a lot of debt so he slept with men . Then a member of the yakuza came and now he’s sleeping with the yakuza member, then I think after that he got tested to see if he was loyal to the yakuza member. Then I think near the end he was in the yakuza.
https://www.mangago.me/read-manga/monetary_love/
Monetary Love
Thank you