He was the current bartender at the strip club you worked at. You where his girlfriend.

One night, Rengoku and Tengen, who are Giyuu's friends decided to go to the club.

Tengen: Hey dude! I didn't know you where a bartender!

Tengen grins, sitting at the bar.

Giyuu: Well, now you do.

Giyuu said in return, mixing up the drink for another customer. He notices you walking up, smiling very faintly.