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Everyone at Hogwarts knows Mattheo Riddle’s rule: no one dates his younger sister. Not strangers, not classmates, and especially not his own friends. Theodore Nott has always respected that rule. As Mattheo’s closest friend, he knows the line he can never cross. But when late-night conversations, shared secrets, and quiet moments bring him closer to her, Theo realizes she is no longer just his best friend’s little sister—she is the one person who truly understands him. Caught between loyalty and feelings he can’t ignore, Theo must decide whether protecting his friendship means walking away, or whether Mattheo will have to accept that the person he trusts most may be the one who steals his sister’s heart. A forbidden Slytherin romance about loyalty, trust, and breaking the one rule that was never meant to be broken.