(I haven't been able to go through all your work, so please excuse the extreme creative liberty I made assumptions from Val's introduction and character sheet and have this treat).
What Val already deemed the longest day and longest night was shaping to become even longer (if that were possible) at the sound of clatter and screams at her door. Well... not just 'her' door-- but rather the large wooden door she shared with her two other flatmates in a dungeon, beneath the lake of a large stone castle.
She bit down a groan, pulling the side of her pillows to muffle the shouts when the heavy curtains were drawn and tugged away from her bed.
She heard him before she saw the mop of long, dark hair and pale face she had often seen at home.
"Phin?!" She wheezed, curling into herself at his weight. For someone younger than she, Phineas Black, II had grown much taller and quicker in the past summer than he had in all the years she'd known him.
"How? You?! You aren't supposed to be here!" Came a cry across the room.
"Pinch, was it?" Val blinked to see another mop of dark hair stalking toward her bed, the amiable smile on Sirius' face slipping into annoyance as he addressed her flatmate.
"Ah, nobody then," Sirius yawned and waved his hand absently.
"Don't be like that, Sirius!" Phineas frowned, sitting up to offer his apologies, "We've only come to say hello to our cousin."
"You couldn't wait till tomorrow?" Val sighed, tucking her legs in as she sat up.
"He couldn't," Sirius smirked over at Phineas.
"Don't listen to him, Val! He's just as excited you're here as I am!"
Indeed, Val turned to catch the light flush of Sirius' ears beneath his long hair, hummed, and raised a brow.
"Hmm," Val nodded, "So... you don't want to hear about the dragon?"
Quick as lightning and a sack of Honeydukes sweets thrown between the three of them, Sirius settled himself at the end of the bed gesturing for her to continue. What was a long day and long night, now seemed shorter in the span of a few seconds. And though the questions about the dragon seemed endless, Val was beginning to feel at home.