"Oh, yes. It won't last more than a few hours" Sam said confidently, hoping that was actually true. In reality he had no idea how a first year had managed to fill a balloon with water and explode it, much less turn it into some sort of blue dye, but if he couldn't figure it out, Filius or Minerva would be able to. He averted his gaze from the unfortunate Miss Gwartney as his lips twitched into a small grin, not because of how she now looked but because of the realisation that his own blond hair was now probably tinged with the same shade of blue as hers.
Now the poor girl was apologising, and unsurprisingly she didn't want to actually disrobe in his office, He couldn't say he blamed her, he thought from the dubious privacy of the closet in which he kept scrolls and books. Quickly he pulled his soaked robes over his head and replaced them with the dry ones, sensing that the prefect was so embarrassed she was about to scoot off without mentioning her request again. Sam felt sorry for her - none of this had been her fault, she'd just had the misfortune to be in the wrong place at the wrong time.
He stepped out of the closet just in time to see she'd pulled the robe over her wet clothes. At least she didn't look like she was impersonating a billywig in those bright blue clothes any more, though he imagined she felt pretty uncomfortable. "Please don't apologise, I'm glad you came to see me" he said, but before he could say any more she had already excused herslf, presumably to head straight back to the Hufflepuff dormitories. Sam shook his head, and flicked his wand, summoning a brightly grinning house elf that immediately made a complimentary comment on Master's new blue hair. He dispatched the creature to discreetly clean and return Winifred's robes once she had changed and then sat down at his desk, picking up a quill.
See you at dinner, she had said. Fair enough. The best way to make it up to her would be to write the recommendation and give it to her then.
[out]