Please help me find this manga???

Looks like a few of my fav yakuza BLs. I’ll leave you with the list below, maybe it’s a fan art or a special promotional release.
http://www.mangago.zone/read-manga/hatsujoukei_drags/

http://www.mangago.zone/read-manga/polaris_no_rakuin/

http://www.mangago.zone/read-manga/gesu_to_abazure/

http://www.mangago.zone/read-manga/tract_porn/

http://www.mangago.zone/read-manga/flaver/

http://www.mangago.zone/read-manga/yondaime_ooyamato_tatsuyuki/

Even if they might not be the one you’re looking for, they are so worth checking out (▰˘◡˘▰)

Ok, I found what you’re looking for. (づ￣ ³￣)づ
It’s called Dr. of Dragon Fire and Melancholy.
You can find the original here (in Japanese) https://books.rakuten.co.jp/rk/174fda2bb898397195fd7381c5c3935f/?l-id=search-c-item-img-17

The mangaka artist behind this is Chihara Nara.
All works on MangaGo here:
http://www.mangago.zone/r/l_search/?name=Nara%20Chiharu

The manga does not appear to be scanlated as yet.

Thanks so much and I’ll check out those yakuza mangas you suggested thanks

Haha! No worries (⌒▽⌒)
Yakuza BLs are a fav genre of mine ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄