Mistress Sophie does not need to tie up her slaves, it is enough if she sits with her big ass on the face of the slave to make him defenseless. So she can play in with his balls and put on him different rubber cockrings on . When his balls are nice and plump and she can take them firmly in her hand and also sitting with her whole waight on it. This will then certainly unpleasant for the guy but fun for the Lady

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