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The bunker was usually a place of heavy silence and low light, but tonight the air in the library felt different—thick, like the static before a thunderstorm.
Dean had come up for a late-night sandwich, his boots thudding softly on the iron stairs. He expected to find Castiel hunched over a dusty lore book or staring blankly at a map. He didn’t expect the light.
It wasn't a physical bulb. It was a shimmering, oily iridescence that spilled out of the corner of the room, casting long, impossible shadows against the bookshelves.
Dean stopped dead. "Cas?"
Castiel jolted. He had been standing with his back to the room, but as he turned, the air seemed to fracture. Two massive, towering silhouettes unfurled from his shoulders. They weren't made of feathers and bone, at least not entirely; they were woven from starlight, scorched velvet, and the terrifying geometry of the upper atmosphere. They stretched nearly to the vaulted ceiling, twitching with a nervous, rhythmic flutter.
"Dean," Cas breathed, his voice vibrating with a frequency that made the teeth in Dean’s head ache. "I... I thought you were asleep."
Dean couldn't move. He’d known Cas was an angel for over a decade, but seeing the *scale* of him was different. The wings were beautiful in a way that hurt to look at—streaked with charcoal grey and flecks of gold, shimmering like a raven’s wing dipped in gasoline.
They were easily twenty feet across, disappearing into the shadows of the rafters. A low, harmonic hum that sounded like a choir singing under a mile of ocean water. Cas looked exposed. Raw. His hands were clenched at his sides, and the wings tucked inward slightly, a defensive, shy gesture that felt entirely too human.
"You're... you're wings... they're huge," Dean managed, his voice a rough whisper. He took a step forward, drawn in by the sheer magnetism of the grace.
"I am a multidimensional wave function," Cas said, though he sounded more like a man caught without his shirt on. "I forgot how cramped this vessel can feel. I needed to... stretch."
"Don't put 'em away," Dean said quickly, seeing the light begin to dim. He reached out, his hand hovering in the empty air where the shimmering light met the darkness. "They’re... Cas, they’re incredible."
The wings flared once, a sudden burst of warmth hitting Dean’s face like a summer breeze, before Cas settled, allowing the celestial limbs to drape heavily across the floor. One stray, glowing "feather" brushed against Dean’s shoulder. It didn't feel like a bird; it felt like a static shock and a memory of home.
"You aren't afraid?" Cas asked, his blue eyes searching Dean’s face.
Dean finally let his hand fall, his fingers grazing the edge of the light. He gave a small, lopsided smirk. "Man, I've seen your soul. This is just the gift wrapping."