A/N: Troublemakers have all the fun! But then have to do the work. For my first detention (but third prank), here you are.
As soon as the last class of the afternoon let out, I bolted through the door and raced through the halls for my common room. Well. I would have raced, if not for the knots of students that kept blocking my path and delaying me (bloody first years, gawking like they haven't seen a ghost before).
But eventually, much mental cursing of the human race's tendency to move slowly when in groups later, I made it to my common room – only to skip through, saying no more than "YAY! Go Loki!" to our House Champion as I made my way to my dorm room. Once there, I cast a series of variations on the Muffliato Charm around my bed, accompanied by several spells to turn away eyes and generally hide what I was about to do. Then, and only then, did I set to work.
It was late evening before I finished, grinning down into two nondescript paint buckets – one full of red paint, one of yellow – with two equally nondescript paint brushes attached to their handles. "Let them try to get rid of this stuff," I said, an evil cackle escaping me before I stifled it, glancing around furtively to make sure no one had heard me.
Thankfully, I was alone in the dorm room still – the others likely working on homework or chatting in the common room, maybe the library. A quick wave of my wand adding a Feather-light charm to the buckets, for convenience (without it, lugging over a gallon of paint around the school would not be easy), before I snatched them up and made my way down to the Library, the agreed-upon meeting place.
I spotted Red easily and made my way over, grinning as I set the paint beside her. "Here you go, my friend." My grin only got bigger as I kept my own pail in my hand. "Ready to start?"
The other girl grinned back at me. "Totally. That's not any of the weak Muggle stuff, is it?"
"Nope!" I replied, explaining the gist of everything I had proofed the paint against. "They won't be getting rid of this for a long ass time."
"Awesome! Ready? Go!"
Both of us darted out of the library, practically flying through the school to paint our tag on every wall, pot, bookshelf and ceiling we could get our hands on. In less than fifteen minutes (yes, there was magic involved in getting around the enormous castle that fast, but I'm not going to tell you what it was!), nearly every room in the school bore the words TROUBLEMAKERS RALLY in some shape or form, in either blood red or canary yellow paint.
(I have to admit, those extra spells on the paintbrushes really helped to give each room a little bit of individuality – I never would have managed to repeat our tag over and over again in that little cursive lettering in the Slytherin common room without being caught without it!)
I took a bit of extra glee in slathering the walls of the Detention office with the tag, and the paintbrush picked up on it, adding dozens of HEHEHEs to the words. I was a little worried about that for just a moment, but then decided it was nice touch and left it – a little because even I wasn't sure how to get the paint off the walls.
A/N: For a look at the planning that goes into these pranks (if anyone besides our Headmistress Clairebear1982 or Deputy Headmistress Little. Miss. Xanda is reading this), check out RedButterfly33's fic of the similar title, Detention, at s/11355381/1/Detention