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Written for the prompt "Asexual!Sherlock/John violinplay. Sherlock is asexual. He's fine with cuddles and his and John's relationship, but nothing sexual. He plays the violin to help John get off." Music-assisted masturbation. Because music is sexy, so is Sherlock, and that's good enough for John.
John secretly plays fiddle. Sherlock and his violin seduce him into a threesome.