One day I came home from school early and I thought no one else was home. I heard noises coming from my sister's bedroom so I went by her bedroom door and peeked in. I was shocked to see her and our family dog together on the floor. My sister was nude and she had her legs wide open and the dog was licking her between her legs. She was moaning and saying good boy you are such a good boy while rubbing his head which was between her legs. I decided to walk in and confront her. When I opened the door she looked up at me and tried to push the dog away leaving her sitting there in front of me totally nude with her legs wide open. I said how long have you been doing this? She yelled for me to get out. I laughed at her and said okay but Mom and Dad are going to love to hear about this. She said p