You have the weirdest fetishes...

On that note, wasn't Star the one with the tail-fetish? Why would Aileris be getting off on it while in his body?

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By that, do you mean the caudophilia or the bondage? Or, was it the fact that I combined them? In any case, I only "have" one of them. (Hint: I didn't have to construct the word for it.) If I could write both well enough to be believable, I'll count that as a good sign.

Indeed, Star is the pony from whom the caudophilia originates. However, via their mental bond and frequent Linking, it has also started to permeate Aileris' mind — albeit to a (usually) lesser degree. For her, it's typically only at the optional level whereas with Star it's definitely preferred. For him, it sort of just has always been there; I'm calling it a biologically induced one*, so when Aileris ended up in his body, there it was. Star retained it since it's become a learned sexual association over the course of about a decade.

*I wish I knew enough to be completely sure this is a legit assertion.

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*I wish I knew enough to be completely sure this is a legit assertion.

AFAIK most fetishes are purely "learned sexual association," with only a few(breasts for one) having strictly biological origin. For giving it to Star as such, you'd need to claim one of two things:
1. Star actually has a "condition"(for lack of a better word) that associates the memories and sensation of hair with the neural pathways associated with arousal. Something along the lines of synesthesia, perhaps. Not the overt version from chapter 1, but more integral to his psyche.
2. Pony biology, at some in evolution/history, favored large tails as a survival trait. As a result, ALL ponies find large tails stimulating to some degree, and Star's obsession is more akin to the Breast Worship fetish than a simple hair fetish.

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Pony biology, at some in evolution/history, favored large tails as a survival trait. As a result, ALL ponies find large tails stimulating to some degree

Seems possible… We've seen in-show that their tails are somewhat prehensile, so having longer ones would be useful. Also, having a long tail would probably be a sign of good health/grooming habits.

Still living the story so far, the clop scene was... for lack of a better word, hawt. Oh, and Scoltland? That is clever, I might have to blatantly plagiarize that!