Under Your Skin Feels Like Home

Taken from this prompt at the Sherlock Kink Meme.

I want naked Mycroft with a plug up his ass rocking gently back against his partner's clothed thigh (preferably John or Lestrade but WOULD NOT SAY NO TO SHERLOCK, JUST SAYIN') it's sweet and soft at first, and he makes the most exquisite noises and he blushes prettily while they trade kisses but after a while it's not enough and he needs to rock harder and pretty soon he's grinding himself down on his partner's thigh so hard and he's almost there and oh god oh god sexy porny times, am I right?

Anyway.

Mycroft fucking himself on someone's thigh, going from slightly embarrassed sexy gentleman to shameless sexy slut.