John Watson bolted up the stairs of his flat, ignoring the hello from Mrs. Hudson. He was too caught up with what state his flat was in. Usually he wouldn't care, but today of all days he did. His sister Harry was coming over to visit and the last thing he needed was for Sherlock to turn his sister into an experiment.

"Please be at a case," John pleaded, before opening the door. Relief tingled down his skin as he stared at the cluttered empty flat. There was no consulting detective playing the violin, thinking on the couch, or shooting holes in the wall. John still wasn't fully relaxed just yet though. John quickly checked Sherlock's room, but from the looks of it the room or the bed has not been touched for at least a week. John was just about to check the bathroom, in case there is a molding experiment in the sink when an explosion popped in the kitchen.

John dashed from Sherlock's room into the kitchen to see the microwave door blown open and Sherlock covered in blood, mush, and soot.

"What the hell are you doing?!" John yelped, covering his nose as the horrible smell from the burnt experiment threatened his nose. Sherlock coughed as the smoke from the microwave curled around him.

"Experiment, man's alibi depends on it…maybe one day," Sherlock coughed. John's eyes widened with fury. Just what John needed. His sister was coming over for lunch and the kitchen was plastered with who knows what!

"Sherlock, can't I leave the flat for ten seconds without you destroying it?!" John shouted, peaking in the smoking microwave. Mrs. Hudson was not going to be happy about this.

"John, don't be dramatic it's not like-"

"John, I'm here!" called a woman's voice from the bottom of the stares. John's eyes widened with panic. Too late, she was already here!

"Who's that?" Sherlock asked, noticing John's reaction to the voice. John frowned at him.

"Make a deduction! It's my sister, who had happened to want to come for lunch today," John informed the all-knowing detective. Sherlock raised an eyebrow and began walking from the kitchen.

"Well, it's about time I met you're dear sister," Sherlock stated, attempting to step out of the kitchen to the sitting room.

"Oh, no, you don't!" John shouted, holding a hand out to stop Sherlock from entering the living room. You stay hidden and clean up in here. I'll go distract my sister. John informed Sherlock. Sherlock frowned at John, but turned on his heals back to the blown up microwave. John sighed, rushing to the door to let his sister in, tossing anything that may make a regular human being sick in a bin on his way.

"Hello, John!" Harry chimed as John opened the door for his sister. She was wearing a red jumper and from the looks of the fresh cut hair strands still on her shoulders she had just gotten a haircut.

"Hi, Harry, I like what you've done to your hair," he pointed out. He would have never noticed if he hadn't learned deductive skills from Sherlock. Harry blushed; flattered that her brother had noticed her new cut.

"Thanks, may I come in?" she asked. John stepped aside, allowing his sister to step into the flat. Her eyes widened in maybe fear, worry, or amazement as she took in what John and Sherlock call their home…or the rats nest…depends what's crawling around in it some days. John guessed that it was probably the first two. "Well…this is…wow," Harry stuttered. Yep, must be the first one.

"Please excuse the mess, Sherlock's been…well, busy and doesn't like anyone messing with his stuff," John informed her. Harry's face brightened as John said Sherlock's name.

"Oh, that's alright…so when do I get to meet your boyfriend-"

"We are not a couple!" John interrupted her. Gosh! Why did everyone think they were? They were friends and that was it!

"Whatever you say, Johnny," Harry giggled, winking at him. John grumbled to himself, wondering why he puts up with this. That's when he noticed Harry walking toward the kitchen. Alarms blared in John's head as he realized that Sherlock was still hiding there covered in his experiment.

"Harry, why don't you go downstairs and asked Mrs. Hudson to bring us up some biscuits? I'll go make us some tea," John offered. Harry frowned suspiciously at her brother for a second, but then trotted back down the steps, calling for the sweet landlady. John let out a sigh and bolted into the kitchen. Sherlock was sitting in a chair, staring through a microscope, still covered in the remains of his last experiment from before. The microwave, the walls, and the floor, however were cleaned up. Well, at least he helped out this one time.

"Sherlock, go get cleaned up and dressed. Harry's with Mrs. Hudson," John ordered him. Sherlock frowned.

"Why are you hiding everything from you're sister? Surly she knows that I'm a detective?" Sherlock noted.

"Yeah, well, the last thing I need is for her to send me to the loony bin for hanging around with you and your maddening experiments!" John shouted. Sherlock smirked at him, getting up from his chair and heading to the sitting room.

"Where are you going?" John shouted.

"To meat Harriet," Sherlock informed him. John paled and grabbed Sherlock by the caller of his shirt.

"No way! You are covered in who knows what! Go put on some new clothes!" John shouted, shoving Sherlock to the bedroom.

"John…but…I-"

"Stop complaining and get dressed!" John shouted before tossing Sherlock into the room and tightly shutting the door. John then ran back into the kitchen, hiding Sherlock's beakers, severed fingers, and petri dishes. Once that was done he started making the tea. John slouched into a chair, exhausted from his frantic run to make sure his sister didn't get scared off by his flat mate.

"John, I have the biscuits!" Harry's voice called from the sitting room. John let out a tired sigh and marched into the room, carrying three cups of tea.

On entering John almost dropped the tray at the sight that lied on the couch. Sherlock was sprawled out on the couch with his hands folded under his chin, wearing nothing but a sheet. Harry stood wide eyed at the consulting detective on the couch.

"Harry…I...Please just let me explain…we-" Harry broke out into laughter, gaining both Sherlock and John's attention.

"Oh, John, if you two were busy I could have come later. You just had to say something," Harry stated. John paled and Sherlock rolled his eyes at Harry.

"We are not a couple!" The two shouted at her. Harry raised her hands in defense with a wicked smile on her face.

"Whatever you say, brother," Harry giggled, strolling to the bathroom to wash up for lunch. John took that moment as an opportunity and grabbed Sherlock by the neck. Sherlock stared at John, unshaken by John's actions.

"What are you doing, Sherlock?!" John screamed. Sherlock frowned at him, shrugging casually.

"I tried to tell you that all my clothes that have not been destroyed by experiments are at the cleaners until later tonight. You wouldn't listen," Sherlock sighed. John slumped onto the couch, kicking Sherlock to one side.

"Well, I guess it could be worse," John sighed. Sherlock nodded in agreement, stealing a biscuit and cup of tea from the tray that still sat on the coffee table John set it on.

"JOHN!" Harry screamed from the bathroom. John and Sherlock both glanced at the shut door with confusion. "There's a head in the tub!" Harry screamed. John slapped his hand against his forehead, realizing he never made it to the bathroom.

"Oops," Sherlock muttered, holding his breath as he watched John's paled face grow bright red.

"Why didn't someone die today?" John growled. Sherlock smiled at his friend and held his phone out for John to see and teased evilly,

"Actually someone did. Lestrade called, but I turned him down. I thought it would be a good night to stay home. Good thing I did or this little meeting would have been such a bore."