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Kinkmeme fill: Mycroft has been out of the country for a couple of weeks/months, all they've really managed is very frustrating phone/skype sex. Now Mycroft is back and it's taking all their self-restraint not to jump each other in the airport.
Once back home, rather than fuck each other senseless - Mycroft ties Lestrade's hands to the bed and proceeds to fuck him very, very slowly.