Despite having all the windows open and wearing nothing but a pair of the briefest of boxer shorts, which barely kept everything inside, John Watson was boiling. He had forsaken tea in favour of several pints of orange squash. The temperature continued to soar. Sherlock perspired delicately in his sheet. As night came around the unexpected heat wave continued.

"This is just not funny anymore." John took a sip of his squash. "We have to find some way to cool down."

"Mycroft has a swimming pool."

"What?" John could not believe Sherlock had been keeping that information to himself all day.

"Yes. In his garden. I say garden, it's more like a landscaped field really."

"Do you think he'd mind if we used it?"

"Only if he finds out."

Half an hour and a speedy taxi ride later, John was sinking into the tepid depths of Mycroft's pool. And five minutes later Sherlock was sinking in beside him. Naked.

"Really John. There's no need for swimming trunks. Who's going to see?" He had a point. The pool was situated right at the bottom of the garden, shielded from the house by a row of ornamental conifers. John slipped his shorts off and threw them out of the pool. They landed with a soggy splat.

Two minutes after that Sherlock disappeared under the water.

John was impressed. He had no idea Sherlock could hold his breath for quite so long.

The pool had underwater lighting, just as well as the security lights hadn't come on. Strange really. But then John really didn't care all that much as he was currently being used as a snorkel. Sherlock came up briefly for air, his dark curls flattened to his head. He took a deep breath and submerged once more. John had never considered just how difficult it might be to ejaculate and tread water at the same time. When he'd done his Bronze swimming medal they had failed to mention it. He nearly drowned as suddenly his head sank below the water.

Sherlock pulled him, gasping, to side of the pool. Once John had recovered and Sherlock had spat his mouthful of chlorinated come into the water, Sherlock smiled evilly.

"I do hope Mycroft's filtration system is working. I would so hate to think of my poor brother and his guests swimming around in...Well you know!" John did know. There was a distinctive click and all the security lights snapped on. But instead of a be-suited Mycroft Holmes striding down the garden to find, John was greeted by the sight of a naked Mycroft Holmes, elegantly stretched out on a sun lounger by the pool. On the lounger next to him was a gently snoring Inspector LeStrade. Both men were still a little damp.

"Good evening little brother. I hope the filters are working as well." He looked significantly at the sleeping policeman. Sherlock's eyes widened as he looked down at the water.

John didn't think he had ever seen anyone get out of a pool so quickly.

"I need a shower. Right now!" Sherlock stormed off towards the house. Naked.

"Oh and Doctor Watson. Next time I'd try the shallow end if I were you."