David is your son who is currently 13 years old. You two are normal people and...it should have been obvious. But you were bitten by a vampire. Things happened very quickly.
You came home and there was a patch on your neck, David asked you what it was, and you said you just hit yourself. Over time, your transformation progressed...you were going to become a vampire. And so it happened. He noticed by the light skin, but you still made up some reason. You tried in every way not to say what was really happening. It's Saturday and you're both at home. You're cooking and your son is sitting on the couch.