Planning a Horse TF Story based on colonial era folklore

[Werewolf1361]

While on a training trip, I learned of an old legend from Colonial times about with es who would turn men into horses and ride them. They'd awake the next morning with no memory of it, but very tired.

I'm thinking of doing a modern interpretation with a female becoming the horse instead of a male. The basic story line is the main character rents a room from an older woman. She transforms into a horse while sleeping. I would appreciate any suggestions.

Some things I'm wrestling with are:

1. What does the witch do with her new horse? Ride just ride?

2. I want a detail of the feet turing hooves. How should the feet change?

3. Possible ways for her to figure out what's happening?