[There is a slight grunt with each smack that's equal parts pain and exhilaration, and he thanks her each time after in a quiet voice. He lasts quite a few times before his voice starts to falter and go too quiet, trailing off into whispers. He's hit his limit, but being Sherlock, he doesn't know he's hit his limit, mainly because he doesn't really think he even has limits. Similar instincts to the ones that made him almost take the pill the cabbie gave him are at play here, making him ignore the limitations of his own body.]
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