Why would anyone ever leave a dislike on something like this?

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I'm pretty sure there are people shifting through the 'porn'-tag just to downvote the stories.

There are also some spelling/grammar mistakes here. Some just downvote for that ...

“Worried you’ll get spanked?” Twilight teased playfully.
Pinkie giggled, “Worried that if I don’t, he won’t spank me!”

Punishment: Not getting "punished".

She hesitated, “That sounds… distracting. And I’m almost always wearing mine, want to get used to it before I end up wearing the full Princess Regalia.”

I wonder what those are (besides the buttplug).
Certainly something to keep her tail raised. Most likely a bridle, with an optional ring gag and/or reins. Maybe horse shoes with tickle enchantements?
Edit: We will get the answer in chapter 5 "Apple bucking". It turned out my guess wasn't that far off.

Shifting her wings, Twilight idly browsed the shelves as she waited. Maybe she should pick up a new vibrator while she was here anyway. Maybe one of the dragon ones, Rarity always liked those.

: "Even I can't always be around. But these toys will help you to keep me in mind the entire time."

I always enjoy this sort of concept, but you should really have someone check this for spelling and grammar mistakes.

Twilight shifted a bit uncomfortably, her wings fluffing a bit. Getting special treatment always made her uncomfortable, but was it enough to refuse and spend half an hour at least standing in line?

And that's how the real corruption begins