Vassalord.

Vampires Charles J. Chrishunds (Charley) and Johnny Rayflo have a strange relationship. Charley is a cyborg and a vampire hunter for the Vatican, while his master Rayflo enjoys a playboy lifestyle. While fighting crimes involving vampires, Charley struggles to control his lust for blood and for Rayflo, while Rayflo delights in seducing his servant and attempts to deal with issues from his own past. Rayflo cares about Charley (also known as Cherry and Chris), and these feelings don't seem to be one-sided.

*The second volume of Vassalord contains a bonus one-shot in the back, a fantasy story called "Zoul Harf" or "Zoul Half." This special one-shot was first published in the Comic Blade Masamune summer issue in 2003.