Every so often i noticed my father in law looking at my wife's breast and ass when ever she would bend over or talk to him. I wanted to see what he would do if he had full access to my phone. I knew he had my password because the other day i had let him use my phone. When everyone went to bed you could hear in the house the sound of the office desk chair moving and my father in law sitting at the computer desk where i had staged my phone charging. I snuck upstairs and hid with full view of the computer desk. I watched as he flipped through my phone, looking at all the various naked pictures i had of his daughter. He would zoom in on pictures of her pussy and asshole and it made me feel so hot. Eventually he pulled down his pants and started stroking his rock hard cock. I watched as my father in law pumped his throbbing dick to his daughters tight asshole and when he came it was the most cum i had ever seen. Now i often bait him his new pictures of my wife whenever we are staying at their house.