I glance back into my sister’s room and see that they’ve moved to the bed, with my sister straddling dad, bouncing up and down on his cock. “Th...t’s it Courtney, ride your daddy. Mmm that feels so good, baby,” my dad moans. “You like that, daddy? You like your favorite little girl riding your big cock?” Courtney teases. Favorite? That slut. I’m too horny to focus on that, though. I lean against the door frame and watch the scene in front of me unfold, as I stick two fingers into my soaking wet. Of course Colin was always dancing with her, at parties or even in our own living room if the mood took us. I would sometimes fantasies that Colin would fuck her in front of me and that would get me off so quick it use to frighten me more than just a little. It also frightened me because I enjoyed setting things up so Jessie would be in some state of undress when Colin was about, call him into our room while she was still naked in bed or just out of the shower with a bath towel around her damp. “I like you a lot. I like you more then you know. I want us to have sex but I don’t want it to feel forced, okay?” She heard his words and said okay in that soft, quiet voice of hers. She felt a little bad but he suggested something a little different. “Let’s do this. Let’s head back to my bedroom and lay down.” He shook his head as he added “I promise we don’t have to do anything. We can lay there and talk and do nothing but that. I promise you that, alright?” She agreed, nothing happened, and. "Before we get any further, I want to lay down some ground rules. Rule number one I've already covered calling me mistress at all times when it's just us. Rule number two in our private times you will wear a collar because I own you. Rule three you will come here every weekend after school starts and on whatever nights during the week that I summon you here. Rule four you may not cum without my permission. Rule five you are no longer allowed to wear a bra or panties without my permission. Rule.