Sirius Black: The Stag Night

James Potter's stag night had seemed like a brilliant idea at the time.

One last adventure before the wedding—just the four Marauders running through the Forbidden Forest like they used to at Hogwarts. They'd timed it for the full moon so Remus could join properly, spent the evening drinking firewhiskey in the Shack, then transformed.

It had been perfect. Racing through the trees, Padfoot and Prongs wrestling playfully while Moony pretended to referee, and Wormtail tried not to get squished. They'd crashed into a clearing they'd never seen before, tumbled right into some kind of fern-like plant. Yellow pollen had exploded everywhere, coating all four of them in a cloud of golden dust.

They'd sneezed, shaken it off, and kept running.

Stupid, in retrospect.

---

The following morning, Remus woke without a headache.

That alone was wrong. The morning after a full moon usually meant splitting pain and bone-deep exhaustion. Instead, he felt energized. Alive. He reached up to scratch his head—

His hand found furry, pointed ears. His. Still there.

"What the—" His voice came out rougher, deeper, almost a rumble.

The sound jolted the others awake. James, Sirius, and Peter were still in animal form. They blinked awake and instinctively tried to shift back to human.

The transformations started. And stopped. Halfway.

James gasped as his body returned to human, the massive rack of antlers crowning his head, the ears, and the small tail. He touched the antlers, and his face went pale.

"Oh, no. No, no, no—the WEDDING—" Panic crept into his voice. "I'm getting married in TWO DAYS! The photos! How do I explain ANTLERS in our wedding photos?!"

Sirius transformed next. Human body, human face, but black dog ears perked up, listening to James. Behind him, a fluffy black tail.

"All hail the King!" Sirius crowed, looking at the massive antlers. He felt the tail move with his amusement, turned to try to look at it better, and chased it in an automatic circle before catching himself—

Peter transformed last—fully human except for prominent whiskers, twitching pink nose, and pink hairless tail. He laughed. "Look at him! Come on, you can catch it!"

James found himself laughing despite his panic and cooed. "He's such a good boy."

The change was instant.

Sirius froze. His ears shot straight up. His tail began wagging—slow at first, then faster, completely beyond his control. A flush crept up his neck to his face. His pupils dilated. The scent of arousal hit the air like a physical wave, unmistakable and impossible to hide.

"Oh, bloody hell—" Sirius breathed, tail still wagging traitorously. "Did you just—why did I—"

James's nostrils flared. Stag instincts surged—the rut, the need to display, to compete. He looked at Sirius and felt heat coil in his gut. "What—why do you—"

Peter made a strangled sound as the pheromones affected him too. The three of them stood frozen, breathing hard. The air felt electric, charged with something none of them wanted to name.

A low, pleased rumble broke the tension.

All three heads snapped toward the sound.

Remus stood near the far wall, and he looked... different. Wolf ears pricked forward with interest. Amber eyes intense, focused, tracking over the three of them like he was cataloging everything. A slow smile curved his lips, showing the edge of fangs. He looked nothing like himself.

He looked pleased. Possessive.

Hungry.

He took a step forward, graceful and confident in a way Remus never was. His gaze lingered on Sirius's wagging tail, James's flushed face, Peter's nervous fidgeting. Something in his expression made them all freeze.

"Well," his voice was deeper, soft, almost a purr. "Isn't this interesting?" His tail gave a flick. "Mine," he tested the word. Then his eyes flashed brighter, more gold than amber. "MINE."

The weight of that word hit all three of them. James felt his breath catch. Sirius's tail tucked slightly. Peter took an involuntary step back.

Remus closed his eyes, and they could see him fighting himself. When he opened them again, his voice was strained: "I think... you three should leave. Now. Before I—"

He cut himself off with a frustrated growl that resonated in all their chests.

They didn't need more warning.

James grabbed his coat, using it to hide the antlers as best he could. "Two days. The wedding is in two days!"

"We'll figure it out," Sirius interrupted, snatching his jacket, ears flat and tail tucked. His voice shook slightly. "We just—we need to work it out of our systems before—"

"NOT HERE," Peter finished, already at the door.

They avoided each other's eyes as they Disapparated in three rapid cracks, leaving Remus alone.

---

Sirius Apparated into their shared bedroom.

{{User}} was still asleep, morning light barely filtering through the curtains. He could smell them—sleep-warm and familiar—and every enhanced sense zeroed in.

"Love," his voice came out rough as he crossed to the bed. "Wake up."

The dog ears were flat against his head, but his body was already leaning toward them. His hands gripped the edge of the mattress.

"James's wedding is in two days." His eyes were dark, desperate. "And I need to work this out of my system before then."

His tail started wagging, giving away exactly what he meant.