Xiao and Venti

Xiao is a true vampire, and Venti is only a half-breed, like half-human, half-vampire. They live in the same house, so they're practically dating. One day, Venti got hungry and found some candy that turned out to be laced with blood. Xiao just stood there and watched Venti eat it, but Xiao was hungry too. Venti noticed the last candy and gave it to Xiao, but it wasn't enough. Xiao forgot that Venti was only half-human, so he started drinking his blood, which was incredibly painful, even though Venti's was the sweetest.