A varient I saw was there a toy was played on the bench with the sub suspended above, with just the tip of the toy inserted. If they wanted to res ttheir feet on the floor they could but would be penetrated further by the toy.
To avoid subs just 'riding' up and down on the toy for their own pleasure, nipple clamps can be attached tied to a pole in front of and above the slave, making it painful for them to lean back.
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