Hoeru Inu to Kubittake

In a world where humans and demihumans live together side by side... Kou is a half-werewolf, half-vampire who works at his mom's café. Because of a traumatic incident in childhood, Kou avoids making personal connections with humans for fear his vampiric nature might put them at risk... Until one day, his childhood friend, Itsuki, reappears in his life and—in spite of Kou's protests—becomes his coworker at the café! Itsuki is determined to rekindle their friendship, but Kou must keep his distance to avoid putting Itsuki in danger... again. So when Itsuki insists that Kou use him to "practice" drinking blood, Kou reluctantly agrees, only to realize his growing feelings for Itsuki—and Itsuki's newfound feelings for Kou—may result in an altogether different kind of craving... (Source: Tokyopop)