The Yakuza's Toy

One night after work, Yuuya's colleagues treat him to an evening of drinks for a job well done on a difficult project. On the way home, while it's obvious that Yuuya's drunken a bit too much... he is in a really great mood. Not wanting the night to end, he heads over to Kurose's place with a present of booze in hand. With Yuuya high in spirits, and Kurose finding his inebriated state so very cute, Kurose also ends up drinking too much. As per usual for the two, they get nice and intimate and... you can guess what happens next! (Source: DLsite)

Tsubaki is an undercover investigator who infiltrated the Soga gang to destroy the headquarters, the Shintou Group, as a whole. His plans came to a halt when the then successor of the Soga gang, Kajiro, saw right through Tsubaki. Rather than throw him out to the dogs, Kajiro let him determine his outcome. Meanwhile, Tsubaki finds out that the Senior Superintendent of the police department and the then head of the Soga gang were in collusion, driving Tsubaki to kill them both in a spontaneous frenzy. This awoke a hidden lust or blood in him that Kajiro accepted with open arms. Tsubaki chose to stay by Kajiro's side, but his role as an undercover cop is still ongoing... (Source: Futekiya) *Note: Includes one extra chapter.*