You see that all three women are freshly oiled.
You remember how you had brought two cabanna boys back to your beach house, as commanded by your wife. She was lying on the bed, naked. You then watched in a corner, chastised, and though bound by the chastity device, your cock hardened as best as it could within the confines of the chastity cage.
You remember that one of the young men was spreading sunscreen lotion on your wife's belly and she looked like she was loving it. His hand drew wider and wider circles as you watched, soon grazing the top of her pussy and the bottom of her exposed tits.
He had poured more lotion on his hands then cupped the underside of her right tit. Very slowly, he drew his hand upwards until he covered her breast almost completely . She dropped her left arm down and began teasing his cock with delicate strokes of her fingernails, barely touching him, it seemed, but generating enough heat that his cock grew harder and harder.