PV Watch out for the prefects

Everybody in the warm, cozy Gryffindor Dorm, nicknamed the Phoenix Pen, was fast asleep. Well, almost everybody.
Youssuf Baid was curled up near the window, reading Great Wizarding Events of The Twentieth Century with a beady, determined eye. All of a sudden, he jerked up, banging his head against the low windowtop. He let out a stream of rather fruity curses, insulting the forebears, the ancestry and the life of the windowsill for all days to come.
Then he remembered what he'd seen. A girl, sitting cross-legged on one of the boulders surrounding the lake. Youssuf jerked his head back down. She was still sitting right there, staring at the Great Lake's surface. He let out a sigh, frowning. He could never abide an unsolved mystery; but was it worth getting possible detention? Ah, dammit. Youssuf dressed quickly (it was still chilly outside) and walked down. He took 5 or 6 pieces of candy from his secret stash and headed downstairs.

He peeked furtively around the Fat Lady, who was snoring herself. Setting off at a sprint, he cleared most of the floors at a quick run/walk. Then he reached the ground floor. He looked around and withdrew behind a pillar as a shadow approached.
Youssuf exhaled with relief; it was only a rat. Its shadow had towered as tall as a lord. He shoved his hands into the pocket and whistled, trying to look as inconspicuous as possible; it wouldn't do for one of the professors to see him through a window.
When he'd reached the boulder the girl was still sitting on, he looked at it quietly. It was too small to hold two people comfortably.
Youssuf said to the girl, "Hello, I'm Youssuf. Gryffindor. Who're you? Why are you sitting on that rock?"

Youssuf frowned at the Ravenclaw named Anastasia Varney, who had climbed down from the rock and started walking away. 'I'm here because I want to'?! What a terrible comeback! Anyway, what was she coming back TO? He hadn't challenged her or anything. Weird kid. She intrigued him.
"Me? I fancied some night air. Also I saw a weird person sitting on a rock and looking at the lake at 11 pm. I wanted to see who it was."
Not just weird, but rude! She'd ignored his response and walked away! Huh. She kinda reminded him of someone, but he couldn't for the life of him remember who. Oh right. Himself. "You ain't getting out of sight of the castle!" he called as he jogged effortlessly up to her. "I do the rounds about this lake every morning, I know every inch of it. You can see most parts of the lakeshore from Gryffindor Tower and the parts that can't be seen from there can be seen from the staff room. Where we are is perfectly fine."
He walked alongside the girl, looking at her curiously. She had long, slightly frizzy black hair, and a very dignified gait. Rather befitting a king, or rather a queen. Perhaps a princess, speaking in age-related terms?
But she looked very pale. Almost vampirical. Strange. He liked it! She was mysterious!

Abandoned after Youssuf's account was deleted