Tonks returned to the Charms classroom at 5 o'clock. She was surprised to see Professor Rigby wasn't there, instead Professor Mcgonagall, looking stern as usual.
"Professor Rigby couldn't make it tonight." said McGonagall, answering Tonks' unspoken question, "I do hope you behave Miss Tonks, you are a bright girl."
Tonks sat herself down at a desk. She was set the task of re-writing some of the detention slips, so got to work.
Name: Amy Mayfield
House: Ravenclaw
Cause of Detention: Flooding the girls' bathroom
Someone got in trouble for flooding the girls bathroom? A Ravenclaw? Weren't they all goody goody nerds like Sandy? A grin spread across Tonks' face. What if she metomorphed to look like Sandy, got herself caught, flooding the girls' toilets and got Sandy into trouble? Smiling to herself once more, she finished the detention slips and left, plotting what she was going to do.

The next morning Tonks got up early and stole some Ravenclaw robes from the laundry room. She changed into them and hid behind a statue, where she changed her features and hair to look like Sandy. She crept over to the girls toilets. She carefully opened the door and half ran to the sinks. Tonks turned on all the taps. The sinks began to overflow, water splashing on the floor. Water splashed on her robes as Tonks waded through the puddles to the cubicles. She flicked her wand. Water gushed out of the toilets, soaking her right through. Moaning Myrtle came out of one of the cubicles looking sour.
"You're going to get into trouble." she said, surveying Tonks' or rather Sandy's appearance, "FILCH!"
Filch came running, Tonks began to run, just in time for Filch opening the door, she ducked under his arm and sprinted along the corridor. She ducked behind the same statue and metomorphed back. She returned the sodden Ravenclaw robes and changed into her Hufflepuff ones. Part 1 of her plan was complete and as for part 2-
"Sandy Dickinson, please come to the girls' bathroom now."
Tonks couldn't help but smile. She innocently sat outside the bathroom door reading as Sandy was being lectured inside. Tonks did feel a bit sorry for her when she came out crying. Professor Rigby came out and glared at Tonks.
"Why is your hair all wet?" he asked narrowing his eyes.
"I had a shower." Tonks said. Rigby looked at the door, then back at Tonks.
"Shut up with your lame excuses. You did this didn't you, you little bitch? You did it with your metomorphing."
Tonks recoiled. Surely teachers couldn't talk to students like this?
"Your behaviour is out of control. We shall go see Professor Dumbledore."