It was Colin Creevey's fourth year at Hogwarts, and he'd finally calmed down a bit, no longer jumping up and down every time he saw Harry Potter. In fact, he'd become quite a talented wizard himself, but his favorite thing was still to take pictures. Frequently, he'd wander down to the lake, or around the edges of the Forbidden Forest with camera in hand.
He'd discovered the Room of Requirement his second year, and for him, it was always the same thing: a darkroom. But no ordinary darkroom, it was outfitted with all of the correct chemicals to develop his pictures so that they would move. He had a truly wonderful picture of the Beauxbatons carriage swooping down upon Hogwarts from the year of the Triwizard Tournament.
Currently, he was developing photographs of the hippogriff, Witherwings. As he agitated the paper in the chemicals, the eagle-horse appeared, with flapping wings and a proud look in his eyes. Colin was quite pleased. Perhaps the Daily Prophet would hire him someday, and he could travel around taking pictures of wizarding events.
After running it through the rest of the chemicals, he hung it up to dry. His timing couldn't have been better, at the next moment, Harry Potter came rushing through the door.
"Where is he," Harry demanded anxiously.
"Who?"
"Draco Malfoy, I know he's in here." Colin shook his head.
"Sorry, Harry, it's just me." Harry looked disappointed.
"Well, if you don't mind, I'll just wait here until he shows up. What are you doing," he asked.
"Printing. I really should put a charm on that door so no light can get in if someone else interrupts me." Muttering an incantation, he waved his wand at the door, and it shifted around a bit until it became a solid black revolving door that would not let in outside light.
He put his next negative into the enlarger and carefully adjusted it until he had it right where he wanted it. Finally he slid a sheet of paper under and turned on the enlarger's light that would react with the paper and show the image once it was placed in chemicals.
Just as he was about to slide it into the developer, Harry did something that forever destroyed the last remnants of Colin's hero worship.
He conjured a patronus.
Instantly, the paper in Colin's hand turned to black.
"Harry! No patronuses in the dark room!"