This was the third time this month something had exploded in the flat because of Sherlock. Sherlock was always mixing chemicals that probably shouldn't be mixed, causing reactions that made John's tea slop over the side as he tried not to be too shocked at the fact that Sherlock could have accidentally killed one of them. 'But I didn't kill one of us', is not a valid excuse in John's book.

But this, this, was going to too far.

The morning after Sherlock caused a mini-explosion playing with a parcel they received as fan mail, John woke up. Same as usual. Except there was something, off, about himself this morning. He ventured into the kitchen for jam and tea, and saw the back of Sherlock's head as he sat on the couch, back straight, sitting incredibly still. Was Sherlock's hair longer? It looked different. He sat down and looked over to where Sherlock was sitting in his normal thinking pose, and John yelped. It was undoubtably Sherlock, but this Sherlock was a woman. And John realized, his voice was higher. Feminine higher. He had been so sleep deprived from Sherlock blowing things up and playing his bloody violin at three in the morning, he didn't notice that he, himself, was a woman. John looked at Sherlock, his face shocked.

"In my defence, I didn't do it on purpose." Sherlock's voice is higher and more feminine, but still has that annoying tone to it that screams 'punch me I'm an arrogant sod'. Pity, he wouldn't feel comfortable punching Sherlock now that he is, for all intensive purposes, a woman.
"What. Did. You. Do?"
"I have discovered that mixing sulfied nixion with the package we received yesterday seems to turn those who ingest it into the opposite gender version of themselves. I don't know yet how long this will last."
"Mycroft?" The Holmes' brother might be annoying, but he could help.
"Mycroft is running tests on us, but says we should resume life as normal while he tries to fix it."
"Resume life as normal?! We're women."
"Good deduction John, your deductive skills are improving ten-fold. You can either call in sick from your work, or say your sister will take over your job while you are sick. We can resume cases as per normal, I'm sure Lestrade will find no problem with it. In fact, while you were having your crisis, he's texted me with a case. Let's go."
And with that, he/she puts on their coat (slightly longer on Sherlock as he is now slightly shorter than before).
This is going to be a long day.

Authors Note:

So, hi! I'll be updating this story once a week or so. Please review this if you liked it! (Or if you didn't, tell me why!) *waves cookies*