Hi guys, I find some manga that the seme and uke are yakuza.
They have tattoo white and black snake on their back.
Sorry for my bad English
I'm pretty sure it's the chapter 6 of Anohito To Nitenai Kuchibiru ~ (๑•ㅂ•)و✧
http://www.mangago.me/read-manga/anohito_to_nitenai_kuchibiru/
I found ch 9 here
but it's not English trans.
https://www.wattpad.com/654630230-yaoi-boku-o-warui-ko-ni-shite-chap-9
Thanks