Zayn was always an overprotective brother. He kept all of Lucille's boyfriends on a tight leash and constantly was chasing them away. No one ever really questioned it; Zayn was her big brother, it's what he did. But, what no one knows is there's a much bigger reason he likes to run off her boyfriends: He loves Lucille, and not just in the normal, brother-sister love. He really truly loves her in every way imaginable and will do anything to have her be his.