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It's been a hard, hellish week for both of them. Bad enough that Greg turns down an assignment from a weary, addled Mycroft, saying all he wants are some simple pleasures followed by a good night's sleep. To his and Mycroft's equal surprise, Mycroft makes sure he gets them.
If this worked right it's sexy, sultry, sweet as hell, and kindly. That's the intent, in any case.