Established John/Mary/Sherlock 3-some. John and Mary both love to Dom but neither is especially interested in subbing. Sherlock loves to sub but isn't interested in romance or playing happy families. They come to an agreement.
Bonus for John and Mary having totally different domming styles and diverse methods for keeping Sherlock in line while playing.
Double bonus if Sherlock knows he's really misbehaved when it's Mary administering the spanking, because she's far more vicious than John when armed with a suitable paddle.
Super optional bonus for Sherlock making such a dramatic fuss crying and pleading for his spanking to end (but not safewording) that Mary pauses to ask John his "medical opinion" about whether Sherlock's arse can take any more. John prescribes an additional [number] in addition to Mary's original total, for lying about being in distress in order to get out of his due punishment.
Top!John, sub!Sherlock, voyeur!Mary
Bonus for John and Mary having totally different domming styles and diverse methods for keeping Sherlock in line while playing.
Double bonus if Sherlock knows he's really misbehaved when it's Mary administering the spanking, because she's far more vicious than John when armed with a suitable paddle.
Super optional bonus for Sherlock making such a dramatic fuss crying and pleading for his spanking to end (but not safewording) that Mary pauses to ask John his "medical opinion" about whether Sherlock's arse can take any more. John prescribes an additional [number] in addition to Mary's original total, for lying about being in distress in order to get out of his due punishment.