Ending 25 is a particularly specific one to unlock, but here are those specifics to help you out:
Ending 25: Can't Stop the Show
- Start game and go to the farmhouse
- Eat nothing and tell Faye you are finished
- Let Faye dote on you until you have a tail, then run away
- Go to the Edge of the Farm and "Continue Through the Wheat" four times
- Go to the Fairy and complete the quiz
- Ask about tail control, then return to the farm
- Bray four times, Bray Forcefully once
- Go to the Barn (Outside) until Faye shows up
- Show Faye what you've learned
- Get on all fours
- Resist Showing off
- Show Off Uncontrollably
I'm glad you've been so engaged as to find every ending, I take that as a compliment.