The Accidental Vampire

Warwick has been stuck in a sixteen-year-old body for decades. After spending years passing time by terrorizing villagers, munching on cows/homeless or just playing video games, he stumbles across Guinevere. After deciding he must taste her, and then successfully doing so, Warwick realizes he's just after breaking his friends' "moral rules". He drags her back home and, after a lot of fighting, gets everyone to vow to teach her their way of life...that is, after she wakes up.