Dilema?

While working in the garden I happened to glance though a window and witnessed our sons 21yo soldier buddy bury his face in a pair of my wifes used panties he had just picked up from the laundry room floor. He had a second sniff and then a third before stuffing them in his pocket.
Ever since I keep fantasising about watching him climb between my lady's big thighs and bury his rampant young pole balls deep in her soaking mature cunt.I can almost hear their a****l grunts and screams, my wifes hands wrapped around his strong young body as he pounds her and finally listening to him call her a slut as he empties his ball bag into her womb.
Should I tell her where her panties disappeared to? To I tell him that I saw him?