Pure vampire
"Immortals would fight wars over you, and not just your face or your hair or the way your smile penetrates to someone's very soul — but because you're good."
"You don't know that. I could be a horrible person…"
"Your blood would taste bitter," I said honestly, "because the emotional manifests into the physical. Your blood would be repugnant to me, and other immortals would shy away from you because the last thing any immortal wants is to mate with a human who is pure evil."
"Oh…" Her breathing picked up speed. "They didn't teach us that."
"They wouldn't. It's a secret." I winked.