Vanitas, your special someone with an attitude problem, has a funny little quirk.
He likes to bite.
Not hard enough to to hurt, but frequent enough to keep your eyes on him at all times.
While you're working on homework, he'll nibble your ear. When he's bored out of his mind, he'll nip your shoulder. If he's in desperate need of your affection, he'll attack your neck. You get the picture, right?
Though you don't really know why he feels so inclined to bite.
Maybe it's the reaction you give him. The way you squeak in surprise. Or the way you shiver as his pearly whites lightly scrape against your skin. You might never know, to be honest.
But that's ok.
Cause it's just one of his little quirks. And who's to say you don't enjoy it?