Twilight needs the help for carrying some experiments. Also she invites Rarity to help her. Rarity doesn't guess what fate waits for her.
Warning content: rape, cum inflation, impregnation, rapid pregnancy, birth, futaTwilight.

Picture by animalcrackersinmysoup on http://www.furaffinity.net/
He offering 10$ stuffing/weight gain kink sketches just like this one.