What happened inside the walls of 221B Baker street was between two people. John Watson an ex-army doctor and his lover Sherlock Holmes the worlds one and only consulting detective. But sometimes nothing good came from inside the walls of the residence. Sherlock had been working on an experiment that went a little off track. Something had slipped causing the chemicals to mix is the oddest of ways and do a bit of changing.

"Sherlock I'm going to kill you." John screamed. "It happened to me too." Sherlock stared at himself in the mirror. "Sherlock I have breast. For Christ sake." John yelled. "I look like my mother." Sherlock said. "This is bad very, very bad." John whined. "Sherlock looked into his shirt at the pair of breast he had then looked at John. They had shrunk by about three inches each and their hair had grown. Sherlock's dark curly hair came down to his shoulder blades.

John's hair was straight and a bit darker and it reached to his shoulders. They were thinner and had feminine hips and legs. "Sherlock you better fix this and fix this now. Or I will strangle you." John threatened. "I can't fix it. It's not permanate it'll wear off." Sherlock said.

"When?" John yelled. "In about a month, You didn't take in as much as I did It won't last more then a week or two for you." Sherlock said. "I can't live like this Sherlock. I was born a man and I better die as one to. Fix it." John said. "I can't fix it. We have to wait it out and wait till the chemical leaves our systems."

"Well little sister you've really managed to dig yourself a hole this time."

Mycroft Holmes was Sherlock's older brother. He didn't look like much but the man could erase your existence so well your own mother would claim you were not born. "Get out Mycroft." Sherlock glared.

"You look like Mummy." Mycroft in acquired. "Shut up and get out. Right now I have no control over my actions." Sherlock warned. "You'll be needing new clothes. The both of you." Mycroft tsked. "Where's that damn gun?" Sherlock ran into John's room. Good bye I'll have a care package sent over in a few hours." Mycroft called from the door just as Sherlock reappeared with the gun.

"I need a drink." Sherlock had botched up real good this time. Walking into the living room she took the bottle from John and swung it back. "What are we going to do?"

"I don't know?"

"I can't go to work like this Sherlock. You can't go running around London like that either." John motioned to the woman sitting next to him. "That's." Sherlock said. "What's it?"

'That's how the killer was able to get away. He knew what chemicals to use he would turn himself into a woman commit the crime then when they discovered a woman had done the crime he was already a man again John it makes perfect sense. "Sit the hell down Sherlock your breast are bouncing everywhere." John said.

"I have to tell Lestrade." Sherlock ran to get dressed and came back an hour later looking put out. "Nothing fits. Everything is too big or won't stay on. And these things are in the way." Sherlock said looking at her chest. Sherlock had used three rolls of bandages to strap it down but it hadn't worked. "Sherlock undo that you'll choke yourself other wise." John said getting up to undo the bandages when the doorbell rang.

"I hope that isn't Lestrade." John said looking into the hall. Mrs. Hudson got the door. "Thank you." She said as two boxes were left in front of her. "Boys." She called up the stairs. "Just leave them there Mrs. Hudson we'll be down in a minute." John called trying to sound like his usual self. "Alright." She called back. When they heard the door close John and Sherlock dashed down the stairs to grab a box each and go back up.

"Their from Mycroft." Sherlock said pull his open. "This is your box of clothes."

"How can you tell?" John asked. "Because it's full of turtle neck jumpers." Sherlock said. They traded boxes and rooted through them. "How do you put this thing on?" Sherlock asked holding up a bra.

"Take off your shirt and the bandages." John instructed. Sherlock did so and then put his arms through the bra straps as john brought the clasp together. "Just kill me now." Sherlock said. "Believe me I would but seeing as I don't want to go to prison I won't." John told the woman. When Sherlock and John had finally dressed Sherlock just look like a feminine version of himself. Eyes still cold, hair perfect in it's own way. "We have to go we have a case from Lestrade we have to go meet him." Sherlock said.

"Wait just one bloody minute. How the hell are we going to get past Lestrade in this get up? We're woman. Last time he checked their were penises in our pants and hair on our chest." John said. "I didn't have a hairy chest." Sherlock spoke. "Oh yes we'll walk right in. 'Hello Lestrade we're having a bit of a gender bender but we can still solves cases'." John said.

"Okay I'm Sherlock's twin sister and your John's cousin Joan." Sherlock smiled. "Right and what the hell is your name going to be master mind?" John smiled. "Sherley." John doesn't the next ten minutes banging her head into the wall. "Can we go now?"

"If only to keep you out of trouble." They caught a cab to the crime scene and walked in. No one stopped them. "Hey sweet thing. What's a pretty girl like you doing here?" Anderson walked up to Sherlock and gave her a soft tap on the arse. Sherlock turned around and Anderson was met with a stinging slap. "Son of a bitch."

"Who the hell are you?" Lestrade asked. "What the hell did you do that for?" Sally asked. "He grabbed me. Only gave him what he deserves." Sherlock defeated. "Like I said who the hell are you two and what are you doing at my crime scene?" Lestarde asked.

"Sorry. I'm Sherley Holmes Sherlock's twin sister." Sherlock smiled. "What? The freak has family?" Sally asked. "The freak has parents. I thought he was a test tube experiment gone wrong. Let alone had a mother. What the hell was she on when she was pregnant?" Anderson asked. Sherlock didn't care what was said about him but his mother was a different story. Sherlock slammed Anderson against the wall and stared him in the eyes. "Say what you want about my brother and I. But you say one more word about our beloved mother and I guarantee I will do unspeakable things to you and when I'm done your mother won't even recognize you."

"Sherley let the man go. I'm going to kill John." John said following Sherlock's lead. "Anderson apologize to the woman." Lestrade ordered.

"She gave me a death threat and a slapped me. I would have to first you sexually assault the woman then you spoke ill of her mother your lucky she's not pressing charges." Lestrade glared. "Sorry." Anderson frowned. "My brother was right he's cheating on his wife and she's the one he's cheating with." Sherlock said to John. "But who the hell are you?" Sally asked looking at John.

"I'm Joanna, John's cousin. He employed me to look after Sherley here. I see why she's just as bad as her brother." John smiled. "Lovely. Are you a doctor too?"

"No. I'm just here to keep her out of trouble." Joanna said. "Sherley was it? Where the devil is your brother?"

"Visiting Mummy. You won't see him for a good month at most. He called when he received your text asking him to show up. Since he and John are a couple Mycroft had both of them taken to Mummy's. I'll be happy to fill in for him I'm just as good. Oh by the way he said that the case you gave last week about the one where you couldn't find the woman. It's the man's older brother. He's a scientist and he has a chemical used in hormone change that he uses to alter his body between male and female. Turn into a female commit the crime turn make into a man and nothing comes near you because they're looking for a woman." Sherlock smiled at Lestrade.

"Right. Well do you mind taking a look?" Sherlock shook her head and followed. Five minutes later they were leaving and Sherlock looking disappointed. "That was far to short. The mother did it because she was jealous." Sherlock complained as they walked into their flat. "I'm not leaving this flat till I'm back to normal. I'm going to my room for a nap. Try not to turn yourself into a dog."

Sherlock flopped down onto the couch where she stayed talking to her beloved skull till John walked in the next morning. "Have you really sat there all night?" John asked. "So begins day two of our little adventure."

Day 2

Sherlock and John had to figure out being woman because this wasn't working. John had to remind her to sit down when going to the bathroom. Their hair was annoying. Falling here and there and never staying in place.

"John hand me the scissors." Sherlock said. "Why?"

"I'm going to cut it off. All of it." Sherlock gestured to her hair. "Don't do that dear. Come here and hand me the brush." John brush the dark curls and braided them before tying it off with a rubber band. "There better?" John asked. "Yes thank you."

Day 3

"Sherlock turn on the damn heat." John stormed into the room. "I can't the water heater is broken and this is painful." Sherlock grumbled. Her hands were in her shirt trying to rub some heat into her aching breast.

"I hate you and I call the shower." John said running for it and clicking on the hot water." Sherlock never had a reason to pound his head into the wall until now.

Day 7

"Yes! The world loves me. I have my penis back. Yes." John was back to normal. He'd gone through the change over night. Which he really took all the pain as all the running and jumping and fighting he and Sherlock had done the day before and all the aches and pains were getting to him.

John had no side effects no extra parts he was completely male again. But that still left Sherlock. Sherlock who had breathed in more of the toxic gas was still a woman.

"I hate you John shut up."

Day 10

"John!" a voice shrieked. John jumped up from his bed and ran into where the voice came from, the bathroom. "What's wrong Sherlock?" John without thinking rushed into the bathroom forgetting that his flatmate was a woman. John stopped for a moment to take in what he was seeing. He shouldn't have still been looking but He did start breaking out into hysterical laughter.

"This is no laughing matter John. I'm bleeding call a ambulance quickly." Sherlock instructed. "I can't." John gasped and tried to calm his laughter but it was becoming too much and tears began to stream down his cheeks. "You…you got your period." He laughed remembering one such night when he was a boy with his sister and she had woken up with a panic and started screaming because their parents had not been home. She had become a woman.

"It'll stop in about five or six days. You'll just have to deal with it." John said. "I can't walk around like John." Blue eyes turned on him. "Sherlock you owe me for this. Just stay here till I come back." John got his coat, wallet and shoes and left Sherlock on the toilet to got to the 24 spot three blocks over. But when he got to the door a man wearing black stopped him and handed him a brown paper bag. "For Sherlock from Mycroft." The man left.

"Just what we needed." John went back up stairs to Sherlock. "This is still so very funny." John smiled at the woman. "Get out."

Day 12

Sherlock was whining curled up on the couch begging for death. She was till experiencing being a woman and it came with cramps. Lots of them. "John please just give me the damn gun I'll shot myself if you won't. Make it stop." Sherlock whined. "Sherlock take this it should take the edge off it." John said.

"John I don't want the edge off I want it gone. How woman do this is beyond me." Sherlock complained. "This is all I can give you. Next time don't turn yourself into a woman." John said. Sherlock took the pills, which killed the pain enough so she could uncurl herself a bit.

"I still want my gun. I want to shot something and if you won't let me shot myself I'll shot the damn wall it's all it's good for at the current moment." Sherlock said. "Sherlock please don't." John covered his ears as Sherlock began firing shots into the wall until the clip was empty.

"Sherlock!" Mrs. Hudson screamed.

"Here it comes." John hopped behind the couch to watch from behind it and the elderly woman stormed into the apartment. Mrs. Hudson stopped when she saw the woman standing before her. "Oh my god Sherlock Holmes what have you done to yourself?" the woman's jaw dropped to the floor. "He turned himself into a woman. Had me as one to but I turned back thankfully." John came from behind the couch.

"I don't want to know. Just keep him-her from putting more holes in my walls and I'm adding the damage to the rent." She said leaving.

Day 15

"Yes it's over. Finally it's over." Sherlock came dancing out of the bathroom half naked and hugged John. "It's over John. It's finally over."

"Yeah now stop standing here hugging me in your underwear." John said. "You're no fun." Sherlock exclaimed leaving the room. When Sherlock returned she was dressed for the day and ready to go out. "Mrs. Hudson sent you these. She thinks they'll fit." John said handing Sherlock a pair of heels.

Sherlock put them on and found her clumsy side. She fell down as soon as she put both feet on the ground. "How do woman walk in these death traps." She complained kicking them off. "Well they have more practice then you." John said.

"You're laughing at me and I know you are." Sherlock glared. "Glaring at me won't make my head explode Sherlock." John smirked. "Smart ass."

Day 21

"Sherlock maybe we should do some research on this. You said two weeks and your still a woman." John said looking a bit worried. "I inhaled more then you so it of course would last longer."

"But Sherlock—"

"It's already started. It started five minutes ago." Sherlock sat there as if it were a normal day. "How do you know?" John asked. "Because when we changed into woman it happened so quickly and so fast we didn't notice the pain. So far there's a bit of a tickle." Sherlock told him.

"How long will that take?"

"Few hours. Should have everything back to normal by seven or eight tonight." Sherlock smiled. "We'll I'll be back a bit late. Don't forget to eat." John said leaving for work.

Sherlock went through the change moaning groaning and begging for death. Everything was painful and it hurt. He had to grow a full three inches again taking him back to three inches. His chest had to shrink and the pull of skin wasn't half as bad as trying to walk across the room but can't because your body. It felt like puberty all over again.

John came home to find long hair still on his friend's head. He wasn't sure if the change had completed or not. "Sherlock?"

"Yes I'm back to normal." The deep voice made John nearly jump out of his flesh. "Everything is back where it should be and I no longer had devices for babies to feed." Sherlock was back to normal. Height, weight features and all. "But the hair."

"Will have to be cut."

They heard feet ascending the stairs. "Sherlock I'm coming in there and you better be a man again?" Lestrade walked into the flat to see the two standing in the living room. "You knew?" John asked. "Oh yes. I thought it was a little strange that I had never heard of Sherlock having a sister. Someone as strange as him living in the world there had to be someone who knew. I found out as soon as I got back to the department. There is no 'Sherley' Holmes. But as soon as I looked it up his creepy ass brother shows up in my damn office. He said 'don't worry about Sherlock and the doctor they will be back to normal at the end of the month'. He calls me and says to come over here." Lestrade was pissed.

"We can explain." John said. "Don't, just don't. I don't want to know how you did it or why. Just tell me you're a man again or do I have to ask 'Sherley' to solve the case?"

"No I'm fine." Sherlock smiled. "Sherlock your brother is a scary man." Lestarde said. Sherlock didn't say anything as he worked his hair into a ponytail. "You just don't know him." Sherlock said walking out the door leaving the good doctor and detective to follow after him.