A/N: Sherlock is probably seven here.
Swim
"Mycroft! What are you doing! Let me down!"
"No. I have had enough. It seems you intend to do everything to annoy me. It has to stop." My exacerbating younger sibling had stopped struggling, but my grip remained vice-like.
"I am bored!"
"You should have brought a book."
I dragged him along, and did not hesitate upon our arrival. He was utterly startled.
I smiled at his yelp as he splashed into the water, but became cold with dread at his next words before he slipped under the surface:
"You are forgetting I can't swim!"