A/N: Here you are, my first attempt at writing kid!lock. Please don't shoot me. I was just trying to cheer up a friend on tumblr by sending her a picture I drew, but felt it wasn't enough so I wrote a fic to go with it. I hope you enjoy.
It always happened this way. Mummy would leave the house, Daddy would be in the study and Mycroft would be reading. Sherlock. Was. Bored. Being the child prodigy that he was, nothing could stimulate his mind to the degree with which he desired. There was only one thing for it. Annoy Mycroft.
"Mycroooooooooooooooooooft." he whined, clutching his brother's knees and giving him the puppy dog eyes for emphasis. Sherlock's acting talents had bloomed at a young age. Mycroft lowered his book and raised one eyebrow disdainfully at his sibling.
"What is it Sherlock?"
"Boooooooooooored. Bored. Bored."
"Well then, find something to do. I'm reading." and with that Mycroft returned to his book and diligently ignored his brother's cries of, "BORED!"
When pestering Mycroft became less of a distraction and more of a chore Sherlock stopped whining and observed the room.
Cake. Boring. Curtains. Could become a superher- no, boring. Chess... Maybe...
"Mycrof-"
"No."
Sherlock slumped in defeat. Then, out of the corner of his eye he saw his father's trench coat sitting on the arm of the armchair. 'Not quite the same as being a pirate.' he thought, 'But it is time to bring out the cookie jar I hid...' an evil smirk appeared across his face.
Young Sherlock tugged at the coat until it fell on top of himself unceremoniously. He peeked out from underneath to check Mycroft wasn't looking. Certain the coast was clear the child detective set off for the parlour.
Umbrella stand? No, not there. Coat rack... No. Ah-ha! Behind the shoe-rack.
Sherlock undid the lid and saw to his chagrin that there was only one cookie left.
'To eat... Or to annoy Mycroft? Or both...'
This was why when mummy returned she would be expecting well behaved boys, but instead got two monkeys scrabbling for the last cookie, one wearing an over-sized dress coat, the other clambering on top of him reaching for the cookie. Taking in their disgruntled faces and realising neither of them had spotted her, she simply strutted over to them, plucked the cookie out of Sherlock's tiny hand, and ate it herself, chuckling to herself at their expressions.