After Zephyr's apartment managed to catch fire and destroy the independent livelihood he had just started getting the hang of, Fluttershy lets him crash at her place to get his life back together... among other favors she's given him to keep him from backsliding into his old ways.

But after she makes the promise of going all the way with her brother if he does exceptionally well at his new job in Ponyville, and he does just that with gusto, their relationship is changed for good.

Fetishes: Incest, Naked Apron, Groping, Oral Sex, Vaginal Sex, Creampie, Accidental Impregnation, Inbreeding, Eventual Romance, Pregnancy, Pregnant Sex, Zephyr is a fucking idiot and that's okay.

Submitted for the Incest Is Wincest's April contest of Sibling clop. Pic is #1951472 on derpibooru. (NSFW!)