What if Harry had been born a girl? Harriet Potter is not the Boy Who Lived, but the Girl Burdened with Prophecy. She wears her father's messy hair and arrogance like a curse, yet her mother's green eyes and stubborn compassion haunt Severus Snape at every turn. The summer after Sirius's death, seventeen-year-old Harriet finds herself adrift. Numb with grief and unwilling to return to the pity of her friends, she flees Privet Drive with no money, no plan, and no will to care whether she survives the week. By day she drifts through London on crowded buses and trains; by night she collapses into uneasy sleep on the Knight Bus among wanderers, the forgotten, and homeless. It is here that Severus Snape stumbles upon her. Exhausted, half-starved, and shattered by loss, she is far from the defiant Gryffindor he knows. Against his better judgment, Snape takes her in. It isn't compassion, not exactly. It's duty. It's the voice of Lily, whispering from his memory: How could you leave her like this? But what begins as a reluctant guardianship twists into something neither expected. The Order insists he continue Harriet's occlumency training, forcing Snape to pry deeper into her thoughts than he ever intended. What he uncovers, her abuse at the hands of the Dursleys, her despair, her defiance in the face of unbearable loss, leaves him shaken to the core. The walls between them begin to blur. She finds a strange steadiness in his presence, even as his sharp words cut too close to truths she cannot face. He sees too much of Lily in her, and too much of himself in her scars. The lessons grow dangerous, the boundaries uncertain, and the summer stretches into something neither professor nor pupil can name.