When the woman leans to sub, in many cases it is easier for a voyeur husband to start or keep on sharing her with other men. At least our experience and interacting with people we know point that out.
A husband could sense that other men are having their way and experiencing these sort of feelings you described. And the mixture of excitment, jealousy, lust can grease the wheels, so to speak.
Wife is pretty aware of the photos we shot (or she takes with other men), but every now and then there is some space for a hot voyeur shot. Like this one.
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