Before Flurry Heart, there had never been an alicorn born in Equestria. It's a magical mystery that doesn't just concern Twilight Sparkle, but the ponies closest to her. She might have finally solved the puzzle, but like any good scientist, she needs to go from hypothesis to proven theory -- and the only way to do that is with help from her big brother.

Content Warning: Incest, Lewd Cadance, Breeding, A Bunch of Exposition Before They Have Sex.

An entry into the Incest is Wincest New Year's Babies Contest