Sisters playing noughts and crosses on your back

Description: Sisters mistress harley and mistress lilith decide to play noughts and crosses on your back, using their heels to scratch the grid, noughts and crosses into the skin of their human doormat.  after playing rock paper scissors to see who goes first, you can watch both sisters digging their heels in to play their sadistic game.  once finished, they decide to rub it all out with their heels to make extra marks.  to finish, they then take it in turns to trample him, stomp and jump in their heels with their full weight.  mistress harley weighs 16 stone/106kg and mistress lilith weighs 13 stone/84kg.