Well, if we're talking "female equine into human" fantasy stories, the gold standard is obviously The Last Unicorn.
Piers Anthony also had a unicorn-to-woman as part of a love triangle (her rival for the hero's affections was a very human robot) in his "Apprentice Adept" series (I think that was what it was called). It was a very Piers Anthony trilogy, so fun when I read it in high school, but I honestly have no idea if I would like it today.
Well, if we're talking "female equine into human" fantasy stories, the gold standard is obviously The Last Unicorn.
Piers Anthony also had a unicorn-to-woman as part of a love triangle (her rival for the hero's affections was a very human robot) in his "Apprentice Adept" series (I think that was what it was called). It was a very Piers Anthony trilogy, so fun when I read it in high school, but I honestly have no idea if I would like it today.