One more werewolf idea but princess who is a werewolf after venturing away from the castle on the full moon. so every full moon her most loyal of knight has to stay by her bed side as she transforms. The king and queen have set up a little area to let her werewolf self run free, but for some reason she stays in her tower, all (k)night.
Don't worry, we gave the knight an amulet to protect from the curse, but they are certainly leaving the tower in the moment drained, and partly scratched and some bites, also alot of fur on them, not their fur, but somebody's. Hopefully the cure will be found soon, it seems the princess has started to suffer from permanently changes, like a big fluffy tail, and wolf ears, and a constant need for pets from the knight...