"Now!" Sirius whispered. James flung the small white pellet across the room, right into Snivellus's potion. Spirals of purple and blue smoke began to rise from the cauldron. You could the the panic - and immediate suspicion - on Snape's face.
Then he froze, like he'd been petrified. Slowly, without anyone else noticing, he began to shrink.
"He's breathed it in, it's started!" Peter squealed.
"Wormtail, keep your eyes on your potion or you could kill us all!" hissed Sirius.
"Sorry."
Lily, Snape's potions partner, had eventually noticed that her friend wasn't moving. And more importantly, that he was shrinking.
"Sev?" She asked uncertainly. His face was beginning to look younger, his whole body was growing smaller and his robes were starting to seem like oversized blankets. Most people had turned to stare at the sight. Professor Slughorn was in the storeroom eating crystallised pineapple, so he had no idea what was going on.
Lily was in a bit of a panic. Her best friend was turning into a baby before her eyes, and she knew who was behind it. Her eyes narrowed as she turned her head to look at the four boys. "Turn him back. Now."
"What, you just automatically blame us?" asked Sirius in mock surprise.
Lily raised an eyebrow at him. "Yes."
A/N: After a wonderful holiday in Portugal, I'm back! Schools starting again soon so when it does, I'll be updating less frequently than before. Also, if anyone has any ideas for what the boys will do next, they're welcomed!