You know how tight I am. He’s going to explode in me.”I scowled. He would. How could Dad resist her underage, nubile body? Maria was gorgeous in a...youthful way. Not the mature delight of my mother. I shoved my phone back into my pocket, my lusts stewing.Near five PM, her client left and Mrs. Nielsen went home for the day. Suddenly, Mom and I were alone in the office. It felt so quiet. She was sitting at the conference room, staring at the papers spread out before her. She looked beautiful. I then repeated on the other side. “I think my daddy is a freak. He likes tying up little girls!” she said with some of her bitchiness returning to her taunting voiceI finished tying her and then let her sit there as she looked at me. She actually stuck out her tongue at me.“Why are you such a bitch?” I asked“Because it is fun!” she laughed“Well tonight you are going to learn that you act like a bitch you will be treated like one!” I said and the tone made her smile melt away“Come on in Kevin!”. " Good. Now, I'd like you to take those shorts off." You said..."I know what I said. Shorts."Looking slightly sheepish, he sat up and peeled the black shorts off over his legs, kicking them to the foot of the bed. I put my hand on his chest and gently laid him down. Looking across him, I felt a pang of desire. I had been determined that he wouldn't be inside me but I so wanted to feel him. I kissed his chest and ran a finger down to his crotch. He squirmed a little as my hand cupped his balls. He rubbed my pussy as I begged him to get inside me. He untied me, positioned me with my ass facing his dick and started to go in real slow. He grabbed on to my head placing his fingers on to the very bottom of my hair pulling it gently. With his other hand he was guiding his dick in and out, real slow and deep, once at a time. He massaged my back with strong up and down motions, rubbing on my shinny sweating skin. He kissed on my back as he entered inside my pussy. Soon he was on top, fucking.