Shut in mourns an unrequited love while a yakuza pressures him to move out; enter the man who's tasked to do what the yakuza couldn't, make the shut in leave, and not only does he persuade him to leave but they find love.
A body guard agency for a coup leader (think yakuza types) brings together two men who fall in love and flee the agency after the older assassinates the leader.
5 guys, two couples. Some kink, some yakuza sub plot. Good story.
One shot
Hana To Ryuu