Unsure of what Mistress intended I placed the silver tray & thankfully unbroken glasses on a counter. my clothing being upstairs I decided I should at...least try to clean myself up. however I had barely started running some water when I heard the door behind me open. To my surprise Mistress explained that this particular guest was know to "take advantage" anytime she could. however that didn't mean Mistress was happy about the incident & punishment would be given. feeling shamefully aware of my. She said it is always the same, a guy watching another guy and woman having sex. Unknowingly, as Kelly had my arm extended taking my blood pressure, I had begun softly rubbing the back of her arm as she talked. I guess, between the conversation and her checking my blood pressure, neither of us realized I was doing it. She removed the blood pressure pump and stepped back, telling me to remove my clothes and put on the gown. She said Dr. Weeler would be in momentarily to perform my physical. I. It all started when I was walking past Kelly's room and I heard some quiet moaning coming from inside. I could easily imagine what was going on and I carefully opened the door. My little s!ster was lying on her bed completely naked, fondling her pussy with one hand and rubbing her tits with the other. She was unaware of my presence; completely drowned in her senses.I stood there quietly for a while, admiring her beautiful body. Her skin looked so smooth and tender. She was thin and her breasts. Tony was still in full flow, alternating between encouragement towards me me and abuse to his wife. I don’t know if they had done this before or not but it was certainly working for Fiona. Each word acted as a spur to keep going and if a particularly depraved bit of abuse came her way, she would suck my cock both deeply and with an intensity that took my breath away. She was grinding her pussy into my face and with her legs draped either side of my head, the words from Tony started to fade into.