He checked the looseness of his frenulum as he stretched it far back while holding back his foreskin. Then he let loose to watch it as it naturally sl...d back behind his flared glands. It stayed back leaving his head uncovered. "Healthy" he said. I was so turned on that I started to masturbate myself while watching this doctor closely examine my husband's cock. I couldn't believe that he would know so much about examining an uncircumcised cock. He seemed to know how to manipulate Rich's foreskin. My first instinct was to tell him to fuck off but £20 was a lot of money then and as they say beggars can’t be choosers. He assured me no one else would find out as discretion was his middle name. After a few minutes thinking about it I nodded at him and told him OK I would do it. He immediately jumped up and said he would be back in a moment and quickly returned with an old dog-eared copy of Playboy and a bottle of baby oil. He then leaned back and said to go ahead when I was ready.I was. “I need more, Master,” I urgently say. “Please, I need more.”He is silent as he slips his cock back inside my throat and starts fucking my face so hard, I am squirming all over in absolute heat. His balls are slapping my chin and drool is dripping down my face as my throat milks his cock with every delicious thrust.“It feels so fucking good,” he says in a shaky whisper. “I’m not hurting you, am I?”He pops me out of my mouth so that I can reply. “Harder, Sir. Make me cry. Make me gag.”He hisses.. At a slug-like pace, the glistening black shaft began to ease its way out of my ass. There was a polite tap on the office door, followed immediately by the click of the latch. I strained my head to look behind me, seeing Sheila’s face peering inside the half-open door. I should have died on the spot of embarrassment, spread out across the desk of the CEO with a massive rubber dildo buried in my ass. But Sheila was my older sister after all, and there were no secrets kept in our cozy little.