I was unbuckled from the floor and led to the bookcase next to the implement rack. Leather shackles were attached to each wrist. A chain was clipped t... each wrist and the chain was lead up to a hole on the underside to the bookshelf bracket where they were again clipped in place. My ankles were bound together with a leather thong. Big Sister then reached around me and clipped a long chain to the end of my cock sheath and forced her hand and chain through my thighs pulling the chain out the. I gave in and watched as my whore now sucked on my cock for several minutes, taking me as deep into her mouth and throat as she could and as hard and fast as she could until she finally stopped and climbed off the bed. Looking at me, "Suck my ass" she softly said as she then turned around and for a minute of two rubbed up and down against me with her ass until I got down on my knees and as she bent over the bed, I moved up and now began to lick around her hole. I then took two fingers and. . moaning. What the...? I thought. I shot a glance at the clock on my wall beside my door. It was 10:30PM, mom and dad could have been... No, dad's not here , I remembered. Dad was away on business. He'd left earlier this morning. Was mom pleasuring herself? Watching pornography? Both?“Shhh.” That got me curious as hell. Why would someone be shushing mom? I left my bedroom and crept toward my parents'. The moans didn't become any louder, and now sounded like they were coming from dad's. " Yes, mum," Sandra said with a huge smile on her face.While both girls turned around and walked towards the front door, Shirley smiled and wondered what was happening between those two. Were they just having some fun, or was there something else going on. Well, she sure was planning to get to the bottom of it, next Sunday."I'm happy you will be here next Sunday," Sandra confessed to Veronique."And why is that?" Veronique wanted to know. She got a sudden feeling that while it had been Shirley's.