The corridor was far too wide and far too dark for a girl to be wandering alone. Greta walked with her chin up, though the movement made her head swim slightly. She had left the common room with a purpose, even if that purpose was mostly to escape the suffocating feeling of being watched by her own housemates. The stone walls felt damp under the torchlight, and the air was colder than it had been in the dormitory. She had turned a corner she did not recognise, stepping into a stretch of the castle that felt older and less cared for than the rest of the seventh year.
Harry was there, of course, because he was always there when she was trying to be alone. He had followed her out of the shadows, his footsteps rhythmic and heavy against the stone. He did not offer an apology for the intrusion, nor did he ask why she had wandered so far from the safety of the Slytherin dungeons. He simply walked beside her, his presence a constant, grounding pressure. The way he moved made it clear that he was not embarrassed by the secrecy of their recent interactions. He was a man who knew exactly what he wanted, and he seemed to want to be in her orbit.
"You are lost," Harry said, his voice cutting through the quiet of the hallway.
"I am not lost," Greta replied, her voice steady despite the way her heart hammered against her ribs. "I am exploring."
"You are walking toward a dead end," he said, a small, crooked smile touching his lips.
"Then let me be lost in a dead end," she retorted, stepping around a heavy stone pillar.
They reached a landing that felt entirely wrong. The torches here were dim, flickering low in their iron brackets, and the stone floor was uneven. It was a place of transition, a way to nowhere, and the sense of displacement made the hair on her arms stand up. A single door stood at the end of the passage, a heavy, dark wood that looked older than the castle itself. It was not a door that welcomed visitors; it was a door that guarded something.
"This is the third floor," Harry murmured, his tone shifting from teasing to cautious.
"It looks neglected," she said, trying to ignore the way her stomach tightened.
"It looks dangerous," he corrected.
They approached the door together, their footsteps muffled by the thick, heavy air. As they drew closer, the temperature dropped. It was not a gradual chill, but a sudden, biting cold that seeped through her robes and settled in her bones. The silence of the corridor felt different here; it was not empty, but occupied. It felt as though the darkness was being held in place by something massive and unseen.
"Do you hear that?" Greta whispered, her hand instinctively reaching out to find the sleeve of his robes.
"Hear what?" Harry asked, though his eyes were fixed on the door.
"It sounds like... breathing," she said, her voice barely a breath.
He stepped closer to the wood, his hand hovering near the frame. "It sounds like a lung. A huge, heavy lung."
The sound was unmistakable then. It was a low, rhythmic-thrumming, a sound that vibrated in the floorboards beneath her feet. It was the sound of something immense, something with a vast capacity for breath, exhaling into the darkness of the room beyond. The sound was heavy and wet, a slow, dragging cadence that sent a shiver of genuine dread down her spine. It was not the sound of a person, but the sound of a beast.
"It is too large to be a person," she said, her fingers tightening on his sleeve.
"It is too loud to be a ghost," he replied, his voice dropping an octave.
"Do not go closer," she commanded, though she knew she had no authority to give orders.
"We should see what it is," he said, his eyes bright with a reckless sort of curiosity.
"It is a mistake to be here," she insisted, her pulse racing.
He did not listen. He moved toward the door, his hand reaching for the latch as if he intended to open it and confront the source of that heavy, rhythmic breathing. The air grew thicker as they approached, laden with a sensation of ancient, slumbering power. The darkness beyond the wood seemed to pulse in time with the sound, a dark heartbeat that filled the corridor. Greta felt a sudden, sharp instinct to turn and run, to flee back to the warmth of the stairs and the safety of the common room.
"Harry, stop," she said, her voice more urgent now.
He paused, his hand inches from the wood, but he did not turn back to her. He was staring at the door, his expression unreadable in the dim light. The breathing grew louder, a deep, guttural heave that seemed to shake the very foundation of the stone. It was a sound of immense weight, of something that had breathed in the dark for centuries.
"It is huge," he whispered, more to himself than to her.
"It is terrifying," she said, the word escaping her before she could think to suppress it.
The moment of tension was broken by a sudden, sharp scrape of stone from the other side of the door. The sound was loud, a jarring, violent movement that made the heavy wood groan in its frame. Greta felt her breath hitch in her throat, her lungs seizing as the sound echoed through the corridor. The breathing did not stop, but it changed, becoming a ragged, searching sound. It was as if the thing on the other side had heard them, or had been jolted from a shallow sleep.
"Wait," he said, his body tensing.
"Something is moving," she said, her eyes wide.
"It is not a person," he said, his voice low and certain.
The sound of the breathing grew more violent, a heavy, heaving gasp that seemed to rattle the door. It was a sound of immense, mindless hunger or ancient, tired life. Greta felt a wave of panic rise in her chest, a frantic need to be anywhere else but in this cold, damp hallway. She felt small and fragile against the weight of the darkness.
He moved suddenly, his shoulder blocking her view of the door. He pushed her behind him without thinking, and she hated it, and later she doesn't.