Prompt from trustingHim17: How does Watson get revenge on Holmes for using him in an experiment?
Watson snuck into Holmes' bedroom, giggling slightly. It was childish, that was certain, but after one of Holmes' experiments gone wrong had turned his hair bright red the day he was due to speak at a medical conference, Watson felt he deserved a little revenge.
Holmes was out investigating something for a case, and, as he had gone in disguise, Watson had not accompanied him. Instead, Watson had taken advantage of the excellent opportunity and had his revenge.
When Holmes returned some hours later, Watson was at his desk, writing away busily at his newest story. He didn't given in to the temptation to look up as Holmes went into his room, knowing Holmes would be sure to spot any signs of guilt.
Only moments later, Holmes reappeared in the sitting room, looking at Watson suspiciously. "Have you seen my magnifying glass?"
Watson still didn't look up, afraid his expression would give everything away. "Not recently. Has something happened to it?"
"It's not on my dresser where it was earlier. Have you moved it? I know you've been in there."
"Just to get a book." He held up the book he had grabbed earlier, knowing Holmes would deduce his presence in the room. "I needed it as a reference."
Holmes still looked suspicious, but disappeared back into his room. Soon after, sounds of things being moved came from the room as Holmes tried to find his misplaced magnifying glass.
Watson pushed away his writing and grinned widely, enjoying how he had befuddled the great detective. He knew Holmes would find the magnifying glass soon enough, but for now, Watson sat back, and enjoyed the Christmas tree's fine new ornament.