As much as possible, we try to keep zoo and D/s separate. Within our contract, she asked for this. And I try to keep things as she asked, however there is a degree of cross-over of course. We enjoy pet-play, for example and I do love to see her as a bitch to our boys.
Her reasoning is that her boy especially cannot be expected to rationalise D/s to the extent that they would understand pain as pleasure. Were they to see me use the cane on her and her reaction, we are not prepared to push their boundaries.