It’s not this! I actually remembered that one after reading this
If I remember correctly the ML had long blonde hair
Man, I was so sure it was that one (￣∇￣")
https://www.mangago.zone/read-manga/bi_no_isu/
https://www.mangago.zone/read-manga/kobi_no_kyoujin/
https://www.mangago.zone/read-manga/bi_no_kyoujin_smoke/
Is it the one you are looking for, these are a sequels from the same manga, it kinda have the same plot
Thank you but it’s not one of these Imaybe I’m remembering the yakuza thing wrong? I’m sure they knew each other before maybe in university or childhood and ML came into the life of MC as someone close to him like secretary or bodyguard and he may have had a grudge against him, he thought MC didn’t remember him and that’s why he chose to sleep with him but he did.
Then I advise you, to search in this tag, you may be able to find it
https://www.mangago.zone/tag/Yakuza%20/?page=1
Also there's these lists, they have everything related to yakuza https://www.mangago.zone/home/mangalist/206/
https://www.mangago.zone/home/mangalist/24495/
It’s about a yakuza boss and his bodyguard? they knew each other before and they start a fwb relationship after the ML joins the yakuza. He thinks ML doesn’t recognise him but he does. I remember the ML likes rough s*x with no love or something