You've put your partner in diapers and now have the urge to wear yourself? This is fairly common and you’ll see it being referred to being a switch (you can play both sides of the power dynamic).
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The key thing to make clear to your partner, if you do want to do this, is this doesn’t change their DD at all. You might be also now wearing a diaper but you’re still in charge and are doing so by choice, something they don’t have.

If you want DD as well as diapers this can be possible where you both act as switches and mutually enforce each others diaper wearing.