Forbidden Prologue

He had grown up with her. He didn't remember a time when she wasn't around. He knew for a long time that they weren't related by Blood, but why, oh why, did she have to choose that pathetic Birth Family of hers back in Hoshido? Nohr became even gloomier after she left, the clouds even darker. Camilla was always quiet, Elise never laughed anymore, Xander was always distant and was never seen. King Garon became horrid... Which led to Terrifying Abuse. Leo needed an escape. An escape from the Abuse, the Torment, the realization that his Sister Corrin was never coming back to him. And that escape lied deep within the Nohrian Mountains, within the towering body of a beast that many would call a monster.