Wasn't Expecting Company

I'm a retired senior. I like to go to thrift stores and purchase stuff that catches my eye. My daughter's birthday was near. I spotted a lovely sheer night gown that my son-in-law would love on my daughter. When I got home I decided how it would fit and look on her and put it on. I forgot to lock my door. I keep my back door unlock so friends and family can get in. I remembered I had tea water on the stove. and went to remove it off the burner with that nightgown on. I didn't hear my son-in-law come in. He was sitting at the table and he saw me in the gown. " Wow ! " he said. I told him it's not mine's and bought it for my daughter. I didn't have under garments on and wondered if he saw my aging body. I guessed he did because was fondling with his privates. He stared at my fuzzy kitty that I have and my saggy breasts. He got up and I saw the bulge on him. I turned around so he couldn't see the front of me. He wrapped his arms around me groping my breast and kitty while grinding his bulge into me. I snapped at him telling him to stop. "I'm your wife's mom ! " He would stop so I pulled out his bulge and started tugging it. He told me to tug it hard and faster. I turned around facing him. He removed the gown while I jerked him and pointed his penis to my bushy kitty. He gave me a load that I never expected and it was all over my hand.
I never told my daughter what her husband did. I wanted her marriage to last.