Yakuza|Host Yaoi

http://www.mangago.me/read-manga/heart_strings/

Host:
http://www.mangago.me/read-manga/heart_strings/
http://www.mangago.me/read-manga/leopard_hakusho/
http://www.mangago.me/read-manga/ano_koro_no_mama_de_ite/
http://www.mangago.me/read-manga/aiyoku_heaven/
http://www.mangago.me/read-manga/ichizude_karen_na_ore_sama/
http://www.mangago.me/read-manga/gokudou_darling/
http://www.mangago.me/read-manga/kizutsuite_romance/
http://www.mangago.me/read-manga/melancholic_trickster/

Yakuza:
http://www.mangago.me/read-manga/koi_made_hyakurin/
http://www.mangago.me/read-manga/kyou_hana_no_gotoshi/
http://www.mangago.me/read-manga/boku_no_shiru_anata_no_hanashi/
http://www.mangago.me/read-manga/grant_my_wish/
http://www.mangago.me/read-manga/yuigonjou_yori_ai_wo_komete/
http://www.mangago.me/read-manga/zettai_unmei_houteishiki/
http://www.mangago.me/read-manga/tsumasaki_ni_kiss/
http://www.mangago.me/read-manga/never_let_go/

Thank you but I've already read all those do you know anymore?

http://www.mangago.me/read-manga/leopard_hakusho/
http://www.mangago.me/read-manga/gokudou_darling/ (Not uke but the seme he's yakuza)
http://www.mangago.me/read-manga/oni_ni_hatsujou/ (well the uke's neither but i thought that it'd interest you cause he's really devilish)
http://www.mangago.me/read-manga/koi_nante_shinai/ (works at a host club not as a host though/also has ties with yakuza)
http://www.mangago.me/read-manga/rakuen_no_ori/ (seme/uke both yakuza)
http://www.mangago.me/read-manga/saezuru_tori_wa_habatakanai/
http://www.mangago.me/read-manga/totally_captivated/
http://www.mangago.me/read-manga/ikoku_irokoi_romantan/
http://www.mangago.me/read-manga/houkago_no_love_call/ (again seme is yakuza)
http://www.mangago.me/read-manga/hatsujou_kareshi/ (uke's a delinquent)
http://www.mangago.me/read-manga/trigger/
http://www.mangago.me/read-manga/beast_feast/
http://www.mangago.me/read-manga/a_night_one_month_later/ (sequel to night S)
http://www.mangago.me/read-manga/don_t_stay_gold/
http://www.mangago.me/read-manga/zion_no_koeda/
http://www.mangago.me/read-manga/tsumasaki_ni_kiss/
http://www.mangago.me/read-manga/gives/
Hope this is enough ლ(´ڡ`ლ)

Also yuutsu no asa and kobi no kyoujin.. But i think that maybe you already read those (￣∇￣")

Yeah I read those too but thanks for trying.
Hard to find good long yaoi manga with host and yakuza.

http://www.mangago.me/read-manga/saezuru_tori_wa_habatakanai/
My personal fav ^^ Yakuza, deep plot.