Disclaimer: I do not own Sherlock or Harry Potter
History of magic could not come soon enough, and when it did Sherlock couldn't wait to see John. As the Hufflepuff's hurried in and took their seats Professor Binns began class. "You were almost late." Sherlock said.
"Professor Snape kept us late in potions. I don't think I'll ever get that potion." John huffed as he showed Sherlock his singed robes.
"After classes are over for the day, I'll help you." Sherlock said as he began planning. They'd need to sneak into the dungeon and into Snape's classroom to work on it. They'd also need the materials. Sherlock spent the rest of the day subtly implementing his plan. John had agreed to meet him in the library where they would leave for the dungeon. By the time everything was set and ready, it was very late and John was looking quite tired.
"It's a rather complicated spell but I wrote the instructions." Sherlock said as he pointed at the parchment. The two began making their first attempt and when it was finished Sherlock's was a perfect poison blue. John's however, was an ugly bubbling green. Sherlock helped John follow the instructions step by step and John's second batch came out a dull blue but it was better. By the time John had perfected it they were both very tired. As they cleaned up John watched Sherlock. "I have another quidditch match this weekend. You should come." John smiled as they finished.
"Hopefully it'll be warmer than the last one." Sherlock smiled. John beamed.
