Rather than draining your blood, right? I feel like the possibility of blood-draining is going to put a damper on any potential relationships.
Oh, hey, I totally get that. I have absolutely no idea how magic works, and anyway, squibs can be born to great wizarding families just the same as great magic users can be born to muggles, right? And, like, your family is made up of some pretty scary dark wizards, but you're cool, and not evil. Maybe the genetic lottery doesn't apply in your world, or maybe it just works differently.