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Sherlock Holmes was not the athletic type so John could not figure out why he would have a pair of trainers in the back of the bedroom cupboard.
“They were part of a disguise I used on a case long before I met you.” Sherlock explained when asked. “The suspect liked to play basketball at a rec center. I joined in on a few games.”
After happily picturing his long, lanky lover all hot and sweaty after a game of “Hoops”, John had Sherlock put on the shoes so they could engage in a sweaty, athletic game of nude one on one.