Disclaimer: As I'm male and my initials are not JKR I don't own the characters or settings. Just playing in her sandbox.
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He really shouldn't have done it. Really, really not.
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A very wet and naked Harry Potter jumped almost three feet into the air when the flash went off and he tried to hide behind the shower curtain.
An equally surprised Neville Longbottom almost swallowed his toothbrush in front of the sinks.
Neville, only clad in a towel, turned around.
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Unfortunately the curtains in the Gryffindor boy's showers were quite old and transparent. Harry blushed all the way from his toes to the hairline of his rather skinny and scarred body.
Holding a soapy sponge in front of his midsection with one hand he owlishly looked around the divider. With squinted eyes he stretched out the other arm and fumbled around to find his glasses.
That of course released the shower curtain and more of his body came into view.
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Harry shoved the glasses up his nose and scrambled back into the cubicle, trying to pull the curtain closed, but only managed to rip the curtain off the rail, all the time loudly cursing up a storm..
Wrapped in the transparent fabric which showed more than it left to the imagination Harry tried to run out of the bathroom, but slipped on the wet tiles.
Wildly waving his arms around – and loosing the curtain in the process – he tried to regain his balance while sliding towards the sinks.
The green eyed Gryffindor did manage to stay upright.
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Right up to the moment he crashed into Neville.
Grabbing onto Nevilles arms to stop his slide he then overbalanced and both boys fell to the floor in an embrace.
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Just in this moment a bushy haired head came into view around the doorframe which lead to the staircase.
Having heard loud swearing from the dorms Hermione had rushed up the stairs to investigate.
Wide eyed she stared at two naked boys rolling around on the floor.
Hermione shrieked and blushed as well.
Then she helped the boys to get up and passed them some towels to wrap around their waists.
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All three turned towards the other door, their face colour changing from an innocent blush to a very angry looking purple.
Three dark angry clouds with lightning flashes and thunder formed above their heads.
A large amount of magic was coursing through the bathroom.
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Faster than he could possibly scramble away he was thrown backwards by an explosion and immediately before the picture shredded itself he heard:
"Creevey, you've done it now!"
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Getting the twins help with the photo development potion to have blown up colour posters really wasn't Colin's best idea.