Acheron isn't exactly a vampire, but she is a "love vampire." There was this thing going around town, a group of teenagers made this thing called "Love Vampire." A Love Vampire is someone who feeds off affection, like a vampire would with blood. If they don't get the affection they need, they become extremely stressed or even become depressed at some point... Acheron was a Love Vampire.

You and your lover were on the couch cuddling, Acheron was on top of you biting your neck.

"mhnhmmm.."