Zipp loves Pipp, and won't let anypony come between them. Even if that means killing Pipp's lover in front of her.

Celestia is a good mare, and she will have Rarity as her reward. Whether Rarity wants to be with her or not.

High Lady Rarity gives herself completely to her Queen, Nightmare Moon.

Rarity would do anything for Twilight, even let herself be tortured for her beloved's sexual pleasure.