Summary: One morning they woke up and realise that something had changed on them... But what is it? They swapped bodies! They can't find a quick solution, so the only thing they can do now is living the other's life... or at least try!

"So what do we do now?"

"I don't know! I don't even now how we..." The detective trailed off as he let his new eyes investigate his new body. "How we..." For God's sake! He had just admitted he didn't know something! "How this happened!"

They were clueless, speechless to say the least. Something strange, something that you only read on fiction books was happening to them. It was like they were characters of a fantasy tale since the moment they woke up. And not having a single idea of what was going on- No, they knew what was going on, the thing is that they didn't know how this happened.

It was exactly 8.01 in the morning when his mobile alarm woke him up from his deepest dream. He rubbed his eyes with the palm of his hands and turned off the sound. He didn't remembered setting an alarm, not even so early. When his eyes caught the ceiling he noticed something strange. That wasn't his room, and that wasn't his bed. And the mobile he was holding in his hand wasn't his. What he was doing in John's room? And where was John?

Sherlock walked down the stairs to the living room looking for John and maybe for an explanation when he saw his own body lying sleeping over the sofa. Something was wrong. Immediately he turned his face to his telly, and his reflection was different. He wasn't tall, his hair wasn't dark and curly and-

He looked like John, like the Army Doctor John H. Watson.

A scream woke his body from the sofa and when their eyes met they knew it without saying a word.

They had swapped bodies.

How?

"Oh my God. We should call Mycroft -"

"No!"

"So what do you suggest we should do?" John asked with his new baritone voice. "Because we need to get back to our bodies! I have a work to attend to and a girlfriend -"

Sherlock, now in John's body closed his eyes and sighed furiously before answering to his flatmate. "You're not the only one who has a life! I've cases to investigate! And look at us now... I'm trapped in your body!"

John, now into Sherlock's body felt it like an insult and fell defeated on his chair. They look at each other and they knew from that moment that the only thing they could do was to wait. Live the other's life and act like the other while they could get a solution and get back to their bodies, get back to their lives.

"We know we can't change this, at least not now, Sherlock."

"Good deduction, John," Sherlock said sarcastically.

John pinched the bridge of his new nose. "So what do we do now?"

John, now in Sherlock's body, watched how the detective was examining his new body. He seemed to be a little bit disappointed. Now he was shorter, blonde, with more weight and with a scar on his left shoulder.

And the doctor, now in Sherlock's body, was looking himself in the mirror. He was all the opposite of what he used to be: he was taller, he had dark curly hair and with a slender body. The physical change maybe wasn't as bad as he though, but there were important things to think about the change.

How were they meant to leave their lives now?

John looked away from the mirror and sat beside his body, now Sherlock's new body. How were they going to manage this? The idea of Sherlock acting like him made him smile: he couldn't even imagine his flatmate the only 'Consulting Detective' in the world being nice, smiling to his patients, wearing the jumpers he had classified as 'dull' and not even talk about Sarah. Maybe they should tell this to Sarah and -

"I know what are you thinking and it's the only thing we can do now."

"What -"

"You're going to be me, and I'm going to be you." Sherlock said.

After all, that was all they could do.