Prompt: (creature/being): Reindeer
Animagus
As Marlene walked hand in hand with Sirius across the grounds of Hogwarts, she tried to process everything he was telling her. He had been wanting to talk to her about this for some time, she knew, but they had all been working so hard to prepare for their final exams that there hadn't been an opportunity for any time to themselves. It was only thanks to this first bright, warm spring day that Sirius had suggested that they take a break and spend some time alone.
Sirius had finally finished speaking and seemed to be waiting for a response from her. But what was she supposed to say to all of that? It was quite a big revelation. "Can you show me?" was the only response she could settle on.
"Sure," he said. "But we have to be farther away from the school. I don't want anyone else to find out." She followed him towards the Forbidden Forest to a hill that sloped down towards the trees. The castle wasn't visible from here, putting them perfectly out of sight.
Sirius glanced around one last time to ensure no one else was watching. "Ok, here goes." Nothing seemed to happen at first and Marlene wondered if this was another of his silly jokes. She was just about to say something when she noticed him changing, crouching on all fours on the ground, black fur covering his body, his face taking on the elongated shape of a dog's muzzle.
"Oh." She blinked a few times, wondering if she was seeing things correctly. "Sirius?" The dog wagged its tail. She knelt down in front of it cautiously, still unsure even though she had seen him transform with her own eyes. She looked into its grey eyes, so full of life and happiness. Just like his. "It really is you. That's brilliant." She patted his head a few times before standing again.
Within seconds, the dog had vanished and the familiar form of her boyfriend stood before her once more, looking at her hesitantly. "So, what do you think?"
"I think you're all crazy for doing this unregistered, but I think your reason for doing it was really nice."
Sirius seemed relieved by her answer. "See, I can be a nice guy." He smiled proudly.
Marlene rolled her eyes. "You're just as egotistical as your reindeer friend."
"Oh Merlin, don't call him that to his face," Sirius warned. "He's a stag and he'll remind you of it if you ever forget. A million times."
Marlene took his hand once more and led him back towards the school. "You'd better tell him not to fall asleep when I'm around or he may wake up with reindeer antlers on his head."
Sirius laughed. "I don't think I'll tell him. I might enjoy seeing that."