Info Thursday
Saga of King Hrolf kraki

The old Norse saga above includes a Loathly Lady story that sounds a little more similar to the one I read because the lady asks to sleep in his bed and he reluctantly agrees and then she turns into a beautiful elf. Then her rapes her. Lesson: don't turn into a beautiful elf around strange men. The story I read as a child did not include rape, so this isn't it, but it's interesting. I do remember something about a house in the woods and she slept in the bed.