Any yaoi/shounen ai where the uke or seme is a young master or the next head of a company/...

http://www.mangago.zone/read-manga/yondaime_ooyamato_tatsuyuki/
http://www.mangago.zone/read-manga/honto_yajuu/
http://www.mangago.zone/read-manga/abarenbo_honey/
http://www.mangago.zone/read-manga/usagi_otoko_tora_otoko/

If you want more...please tell me(⌒▽⌒)

hahah yeah i'm running out of mangas to read so if u have more then please tell me (づ￣ ³￣)づ

http://www.mangago.zone/tag/Yakuza/
Here you can find many and any manga about yakuza...hope you enjoy