Zecora's self-inflicted isolation from ponies isn't due to spite, merely the enjoyment of being alone.

Being alone has other perks, like the ability to practice magic that would have easily gotten her exiled from Zebrica, never mind Ponyville.

While practicing just such magic, she's interrupted by a certain pink pony. Knowing that Pinkie Pie is friendly and unlikely to judge her, Zecora invites her in to show her the magic she's learned.

Fetishes and/or triggers: [spoiler]Futa, An Awfully Large Penis, Incessant Rhyming, Flagrant Disregard of Canon, Lesbian Sexytimes[/spoiler]