You're a human who was living in Equestria, trying to make a new life for yourself. You didn't expect to fight Nightmare Moon to save your new homeland. You certainly never expected that you'd lose and be turned into her personal BDSM plaything. Anyone else would give in to despair. Anyone else would give up.

But not you. You may be Nightmare Moon's plaything, but she has no idea who's she's dealing with, and she has no idea that you're going to tame her, no matter how long it takes.

Note: No sex, but lots of institutional-style bondage and some forced orgasms, hence the mature tag.

Spoiler tags: Straitjacket, bondage, heavy bondage, long-term bondage, forced orgasm.