Very Very Totally Completely My Type♂

Kiyokage Usui goes to his usual bar after a long hard day at work, where he is immediately drawn to a staff he's never seen before, Daikichi Amo.
"I want you, Kiyokage, to get to know me."
Daikichi, similarly attracted to Kiyokage, makes a move on him and they end up sleeping together that same day. Not wanting to end things just as a one-night stand, Kiyokage hopes to be in a relationship with Daikichi. However, Daikichi tells him something about himself that is completely unexpected...

(Source: MangaPlaza)

Note: Includes one extra chapter.