At my wife's parents' house, it was customary for both my sisters-in-law and me to return to the house where our parents-in-law lived at the same time. This year, too, that time has come, and while I am visiting, I find myself walking the hallway, feeling out of place compared to my own home, and accidentally witness something I shouldn't. My sister-in-law's act of masturbation... This incident has led to a secret I can't tell my wife... Amidst the complex incestuous relationships between in-law siblings and the betrayal of being cuckolded, despite the sense of transgression, I am lost in the pleasure and excitement...
