David could see a large woman on her knees in front of that man.“She’s on the last one now,” the man by his side said, “you can cum in her mou...h or on her face whichever you like, l know she’s a fat cow but she gives a good blow job.”David had read about dogging but never experienced it before. As he approached the group, he saw that the man in front of the woman had hold of her head and he was fucking her mouth, pulling her roughly back and fore on his cock. The woman had her hands on his. My sister saw the message and asked me if I was going to do it. I have never been dominated so I told my sister I wouldn’t do it most probably. She had this horny look on her face. She told me that she wanted to try something dominating. When I saw that horny look on her face I was aroused too. “ Well, lets give it a try”, I told her. Mom usually talks more than an hour with the neighbours , so we were safe. My sister told me that I would have to call her Ma’am for the time being and I would. His fingers slid out of my hole and I felt the thick knob of his dickbeing smeared up and down against my asshole. Then he squared it rightat the center of his target, and I felt his hands gripping my hips. "Itmight hurt a bit at first, but just remember to relax and soon you'll beenjoying it". I loosened up and felt the cock slowly pry open my butt.It felt huge and stung for a few seconds. He pushed it all the way inand slowly pulled out and in again. I yelled out in satisfaction and. " Is something wrong?" I should just go." Her voice wavered."Did I do something wrong?" No!" The suddenness of her answer startled them both. "No, of course not. I just..." She bit her lower lip. "I just really need to go now."Alex looked at her; her whole body was tense. Defensive."Okay," he said quietly. "Just let me change my pants." He hesitated a moment, but when she just turned back to the window, he hurried out.Alex's gym bag looked tiny sitting alone on the floor of the empty walk-in.