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A Severed Thread

Summary:

When Severus Snape dies in the Shrieking Shack, he expects it to be the end.

Instead, he wakes in Godric’s Hollow on the night Lily Potter dies—years younger, with full memory of everything that followed. This time, he doesn’t step back. This time, he takes the child.

With Harry Potter in his care, Snape sets out to change a future he knows too well—one shaped by war, manipulation, and a boy raised to die. But protecting Harry means stepping outside both the Dark Lord’s reach and Dumbledore’s design, and into alliances Snape has never trusted.

Gringotts is watching. The past is shifting. And the child in his arms carries far more than a lightning-shaped scar.

Chapter 1: The Choice

Chapter Text

Severus Snape became aware of the wood beneath his palms before he understood where he was. The grain pressed faintly into his skin, uneven and dry, and there was the lingering scent of smoke in the air, not heavy enough to suffocate but persistent. Beneath it lay the sharper residue of magic recently cast and not yet dispersed. He did not move at once. Instead, he remained where he was trying to understand what happened.

He was breathing steadily, and that fact alone required attention. The air moved through his lungs without tearing his throat. There was no venom pooling at the base of his tongue, no warmth spreading across his collar. The memory of the bite remained with brutal clarity in his mind, but his body did not confirm it. When he flexed his fingers against the floorboards, they answered him with strength instead of weakness.

He opened his eyes and took in the ceiling above him. The beams were exposed and darkened by years of smoke, and the proportions of the room were unmistakably domestic. A narrow hearth stood to his right, its embers still faintly alive beneath a crust of ash. The front window had shattered outward, and cold night air drifted through the broken frame, stirring dust along the floor.

This was not the Shrieking Shack. The Shack had sagged with damp neglect and smelled of rot and old wood. This room carried the scent of habitation, of a life recently interrupted but not long abandoned. Recognition did not strike him; it settled into place with quiet inevitability.

Severus did not move.

The conclusion presented itself too cleanly to be trusted. He remembered the bite with precise clarity. The puncture, the venom, the slow collapse of breath and thought as his body failed him was his last memory. There had been no ambiguity in it. No uncertainty. He had known, with absolute certainty, that he was dying.

That certainty did not match the body he presently occupied.

He drew a measured breath and held it briefly, testing for the tearing pain that should have followed. None came. His lungs expanded without resistance. His pulse, when he turned his attention to it, was steady and unlabored. There was no weakness in his limbs, no tremor of failing strength. Even the dull exhaustion he had carried for years—the accumulation of strain, of long habit and older damage—was absent.

He was not merely alive.

He was… restored.

Severus examined the changes with deliberate care. A head injury might account for confusion, but not for the complete absence of damage. Hallucination might distort his perception, but not reconstruct sensation with such precision. The body he inhabited was not failing. It was not even familiar in its usual way.

It was younger.

The realization settled into place with urgency, resistant to denial. He was not mistaken about what had occurred. He had not survived it.

Severus exhaled slowly.

The disparity was temporal.

He set the question aside. Understanding could wait. The situation could not.

He pushed himself upright and turned.

Lily lay several feet away near the doorway to the adjoining room. Her body had fallen toward the nursery as though she had been moving when the curse struck. Her hair spilled across the boards in a brilliant red cascade dulled by shadow, and one arm remained extended, fingers curved inward as if they had nearly closed around the frame of the door.

He crossed the room with slow, deliberate steps and knelt beside her. His movements were measured, precise, as though moving carefully might preserve something in what was lost. He did not touch her face. Instead, he brought his fingers to the side of her throat, feeling for warmth rather than a pulse. Her skin had already begun to cool beneath his touch.

He bowed his head and exhaled slowly. The familiar ache of loss he had carried for over a decade settled heavily in his chest.

The Killing Curse left little ambiguity. It did not wound or bruise; it simply removed. He knelt there longer than necessary trying to breath around a fresh wave of grief, then withdrew his hand and let it rest against his knee. Lily’s other hand lay open against the boards, palm upturned and empty.

The house remained quiet around them. A beam shifted faintly overhead, and somewhere a fragment of plaster slid from its place and settled with a soft scrape. No voices called from outside. No footsteps crossed the garden. The stillness pressed inward, heavy and undisturbed.

A small sound carried from the nursery beyond the doorway, thin and uneven.

Severus lifted his head and listened more carefully. The sound came again, this time clearer: a child’s breath catching and releasing in quick, indignant bursts. He rose slowly, as though any sudden movement might fracture the fragile balance of the room, and stepped toward the nursery without looking back.

The cot stood against the far wall beneath a window filmed with dust. A faded mobile turned lazily above it, stirred by the draft from the broken front window. The child lay on his back with the blanket twisted around his legs. His eyes were open, unfocused in the dimness, and the wound on his forehead was raw and vivid against pale skin.

The child’s hands opened and closed with clumsy coordination, fingers flexing as though testing the air. His chest rose and fell too quickly, and his cry sharpened as Severus approached. There was nothing yet in his expression that suggested fear; only discomfort and the raw insistence of being alive.

Severus stood beside the cot and watched him for several seconds. He took in the details without commentary: the small tremor in the boy's hands, the way one foot kicked free of the blanket and stilled, the faint sheen of moisture along his lashes. The child sneezed suddenly, and a brief puff of golden sparks burst into the air before fading.

Severus did not startle, though his gaze sharpened. “Typical, Potter,” he murmured quietly, and reached down to straighten the blanket that had twisted beneath Harry’s legs.

Harry reached out and grabbed the edge of Severus’ robe. His fingers tightened in the folds of black wool, knuckles paling with effort. The child’s grip was clumsy but persistent, and Severus felt the small tremor in it each time the boy drew breath. He did not immediately move to free himself. Instead, he stood very still and allowed memory to assert itself.

He knew how this night unfolded if he stepped back.

He had seen the cottage at dawn, emptied of warmth and filled instead with Ministry voices and Dumbledore’s quiet authority. He had stood outside the circle of grief and accepted what was required of him. The boy had been carried away. The wards had settled. The war had proceeded along its brutal, predictable line. There had been years of watching, of enduring, of telling himself that necessity justified the actions of himself and his masters.

If he withdrew his hand now, the night would close around the gap. The steps in the lane would reach the door. The child would be found and history would resume its accustomed shape.

He reached down with a shaking hand and softly covered Harry’s hand with his own. His fingers flexed once against the child’s grip but did not pull the boy’s grip free.

Any alternative future was unknown and therefore dangerous. It offered no assurances. It did not promise redemption. It did not even promise improvement. It offered only change, and any change had a cost. He understood the price of uncertainty intimately. There would be no Dumbledore to absorb the consequences if he interfered. There would be no larger design to shelter behind.

Harry’s other hand struck weakly against his chest and then stilled. The small body leaned forward as far as the confines of the cot allowed, as though balance itself had shifted toward him.

Severus exhaled slowly and closed his eyes against the sharp sting of remembered loss and betrayal.

He had endured one version of the future. He knew precisely what it demanded and what it consumed. The knowledge of that future was almost comforting in its predictability.

The unknown asked for something else.

Outside, gravel shifted faintly beneath approaching steps.

The sound was distant but distinct. Severus lowered his gaze to the child again and considered the small hand gripping his robes. He could release those fingers with little effort. He could step back and allow the night to resume its former shape.

Instead, he slid one hand carefully beneath the boy’s body and lifted him awkwardly into his arms. Severus had little experience holding young children and the surprisingly soft, trusting weight of the boy in his arms was startling. He shifted his grip to support the child properly, and the boy let out an obstinate grunt of protest before subsiding into uneven breaths against his chest. The warmth of the small body bled through cloth and into skin long accustomed to colder contact.

The magic in the air tightened as if in warning as he turned toward the rear of the cottage. The sensation pressed briefly against his ribs and ears, not painful but insistent. When he crossed the lesser wardline at the boundary of the property, with Harry in his arms, resistance surged and then wavered.

Anxious about the possibility of being stopped, he did not pause at the threshold. He stepped into the lane beyond the back gate of the cottage, the night air cool against his face, and felt the resistance settle into something still and watchful. Harry’s breathing steadied slowly against his shoulder, though his fingers remained caught in black wool.

Severus closed his eyes briefly, adjusted his hold with visible conviction and began to walk without looking back at the house behind him.