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"Sherlock Holmes his flatmate, once again, was shooting the walls.
Once again, yes, because John was aware that this was at least the second time that the great Sherlock Holmes did that, claiming that he was bored."
So John comes home to Sherlock shooting his gun against the wall once again, but this time John knows exactly why. Sherlock is sexually frustrated. John tells Sherlock his deduction, how is Sherlock going to handle that?...
(There's a very important note at the end of this work, please read it. And also, enjoy your reading!)