Immoral Barren XXX Mark

Synopsis

Itsuki Sena is the hostile, blunt lone wolf whose motto is to pick fights anytime he can. One day, a vampire who calls himself Lark appeared in front of Itsuki. "So you're my food...?" he said and suddenly sunk his teeth into Itsuki's neck, only to realize that the blood tasted extremely awful and it made him writhe around on the ground...?! Despite still complaining about the taste after that, Lark sucks Itsuki's blood at every opportunity. However, there's some kind of aphrodisiac in the vampire's fangs so every time he's sucked, Itsuki gets hard...!! (Source: Kasakura Shuppansha, translated)