Mischief Managed Christmas Edition

Snogging in Grimmauld's peace? Why on earth could anybody do that? Fred and George have invented something new, Sirius is bored. As for Tonks, she's on duty on Christmas Eve, and Remus is particularly grumpy to have his book hidden by Kreacher. The story of a Christmas prank -not exactly- gone wrong, from five different points of view. Have yourself a very merry Christmas!