Disclaimer: Don't own Sherlock.
It had been 48 hours since their last case. Sherlock had reached catatonic levels of boredom lying on the sofa, staring at the ceiling. John sat in his chair, reading a book.
"Why hasn't there been anything new? Call Lestrade, ask if there's anything new."
"I'm sure there'll be nothing new since you called him this morning."
Sherlock sighed. Listening to the silence, John got an idea. He put his book down carefully.
"Sherlock… are you ticklish?"
Sherlock's head snapped round.
"Of course not." But there was slight fear in his eyes.
John smirked.
The fear increased.
"No!"
John pounced.