Read Like the Beast at Bonmanga !
Tomoharu Ueda is content being a police officer in his neighborhood. He likes helping people, and in return, people like him. One night, he gets visited by a yakuza who turned to be the victim of the underwear thief he caught the previous night. The yakuza is Aki Gotouda, the heir of the Gotouda group, who thanked him for catching the thief. To Tomoharu’s surprise, Aki confesses that he has feelings for him. Thus starts a forbidden relationship between a police officer and a yakuza.
Alternative ほんと野獣 / Honto Yajuu