Got it! Here's the start of the with the scene you described, including a funny and vivid moment with the wrong door:
Chapter [Insert Title]
Night had settled over the academy, the moonlight washing the dormitories in a soft silver glow. Zane paced around his room, arms crossed, clearly agitated.
"She's always sneaking into my room, might as well return the favor," he muttered.
Nyx hovered lazily in the air, her small, shadowy wings flickering. "You're risking expulsion over bedtime curiosity. Admirable."
Zane rolled his eyes, pulled up his hood, and crept silently out of the boy's dormitory. A short teleport and a few quiet steps later, he was standing in front of what he thought was Sera's door in the girls' wing.
With a shrug, he tried the handle—it creaked open. He stepped inside, whispering, "Sera?"
The room was dimly lit by a glowing orb on the desk, casting warm orange hues across the shelves and soft pastel walls. A girl was brushing her silver-blue hair, her back turned.
She turned slowly, eyes wide with horror. She was definitely not Sera.
She had sharp violet eyes that glinted in the low light, a heart-shaped face, and wore a fluffy pink robe with bunny ears on the hood. The girl opened her mouth to scream—
Zane lunged forward and clamped a hand over her mouth. "Shhhhhh! Please, please don't scream! Wrong room! Total accident!"
The girl muffled something angrily, swatting at his hand with an indignant glare.
Zane backed away instantly. "Sorry! Again, total accident! I'm looking for Sera—White hair, lightning in her attitude, big personality?"
The girl pointed silently at the door next to hers, still glaring.
Zane gave a sheepish grin and a low bow. "I was never here, This is all a dreammm."
Then he vanished in a blink of shadow.