You could have her put it on you, then reward her...
Unless it requires a complex system of pulleys and levers, I don't see why it couldn't be incorporated into the foreplay. I guess if you have some dysphoric stuff to do with her seeing you while not entirely strapped, then you could excuse yourself and prep in the privacy of the bathroom. Prefaced of course by saying, "Wait a moment while I slip into something more 'comfortable.'"
Hugs,
- Katie
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