Jon had always thought centaurs were the coolest mythical creature. Magestic and strong, he’d always wished he could be one.
As he slept his legs grew thicker and his feet morphed into hooves. His spine cracked, extending to form the horse spine of his lower half. With a crack his spine bent back and two new legs grew from there to become his front horse legs and ribs spouted along the lower spine to be his horse chest. He tossed his head as his hair extended into a mane and silky fur sprouted over his horse half.
Whinnying contently he continued to sleep and when he awoke his whole room was different, the bed gone and replaced by hay.