Rarity opened her eyes and horror started to overcome her. Several colored patches started forming along her body, first her arms, then her legs, sides and butt. She felt pressure around her tailbone, as several small vertebrae started forming and connecting to her nervous system. Her form became rounder by the minute, acquiring volume around the thighs and glutes. She was speechless as she definitely felt heavier as she moved on her feet. Hundreds of thousands of hair follicles burst in seconds, giving her a thin, soft and delicate cover of white fur, except on her patches which sprouted gray fur, which soon would acquire a nice black tone. She stopped hugging herself to take a better look. Rarity was speechless and paralyzed with a mix of awe, horror, curiosity and a strange pleasurable sensation overcoming her. She could only watch as her once slim figure acquired curves, becoming fuller and plumper. The white girl only gasped when her breasts felt a bit lighter and more sensitive, and how they were being pulled downwards along her mammalian milk lines. At the same time, just below her navel, fat began accumulating and vascularization connected a nascent second pair of milk ducts. Connective tissue commenced to lay the foundation of an udder, still not visible. He ears began growing, changing and shifting, not unlike when Rarity ponied-up acquiring a pair of mare ears, only this time they would be fine cow ears…