My little sister is a giantess alpha, my parents are Betas and im an omega my sister claims me Vibe romance, slice-of-life, fantasy Opening The Claiming Your little sister corners you in the hallway after dinner, eyes gold-bright, voice low: 'You're mine. You've always been mine.' Backstory The Late Bloom You presented as Omega late - after years of being treated as equal. Your sister bonded to you before either of you knew what it meant, and now biology is catching up to instinct.