Because I'm bored you get a new chapter. The usual disclaimer applies, we don't own HP.
Just in Case
May 12th (midnight), May 13th, May 26th 1992
Third Year
Jo and Leilani were attending their astronomy class when Jo saw it out of the corner of her eye. An entire chunk of the tower floor was see-through. Students spent so much of their time looking up in this tower that they didn't even notice that they could see right through a section of the floor. It was the most discombobulating thing Jo had ever seen and this was her third year at a school where the ceiling reflected the sky and weather outside, staircases moved, had sinkhole steps or became slides when boys tried to climb them.
"Leili," she whispered, "look down to my right and don't make a sound," she instructed. Leili looked casually to where Jo had indicated and had to clench her teeth together to keep from saying something. She walked around Jo to nudge the area with her foot, the toe of her shoe slipping under the edge of what ever was causing it and vanishing as well. "I love magic," Jo said quietly. Leili picked up the thing and discovered it was fabric, a silky fabric that felt like water in her hands.
"Feel it," Leili whispered and Jo stroked it gently with her fingertips.
"Wow," she whispered, marveling at its texture. "Quick, fold it up and stick it in my bag, we can figure out what to do with it later." Leilani did as she was asked and the next day before Herbology, Jo pulled it out of her trunk and the girls sat on her bed to examine and decide what to do with it.
"Well, we can't keep it, much as I'd love to; this thing is seriously cool," Leili said, she was trying to avoid touching it by sitting on her hands. If she touched it, she'd want to keep it and it wasn't hers to keep.
"It's invisible fabric, right? I didn't know there was such a thing,"
"It's not just fabric, it's a cloak. I've heard stories, but I never thought I'd actually see one."
"Considering they're typically, y'know, invisible?" Jo said cheekily.
"We could try finding out who it belongs to and return it…" Leili suggested.
"People would be clamoring to claim it. We could turn it over to Professor Sprout," Jo told her.
"It wouldn't be safe enough with her. I hate to say it, but if someone found out she had it they could break in and steal it and it'd never get back to its rightful owner. Our house defenses include tapping a rhythm on the barrel and getting doused in vinegar if you do it wrong. We need someone with more pull, someone no one would dream of stealing from, let alone be able to steal from,"
"We need Dumbledore," Jo finished for her.
"Yeah," Leili agreed. The bell for the next class rang and Jo put the cloak back in the bottom of her trunk, it'd be safe with them until they could get it to Dumbledore.
It took three weeks before the girls were able to see Dumbledore. "Ah, Miss Montgomery, Miss Akina, what can I do for you?"
"You can keep something safe," Jo said.
"We found this, a few weeks ago now, at the top of the astronomy tower. We don't know who it belongs to and we figured the best person to leave it with, the only person who could stand a chance at finding out who it belongs to, would be you," Leili explained. Dumbledore looked at them over the top of his glasses before Jo reached into her bag and pulled out the Invisibility cloak. The light from the window hit it, making it shine a silvery lavender where it had looked silvery blue in their common room.
"Ah, you brought me an Invisibility cloak. As it happens, I do know to whom this belongs, I will see it rightfully home today. Thank you, girls," Dumbledore said, taking the cloak from them and folding it neatly in his desk drawer. As the girls left Dumbledore took out a slip of paper and a pen and scribbled a note in his narrow, loopy handwriting, "Just in case."