Her not wearing panty meant that she had come prepared to give him a clear indication that she had come to be fucked. As my MD’s hand went down over...my wife’s pelvis, he also realized that she was not wearing any panties. He whistled excitedly and my wife crossed her legs and tried to hold his hand and stop it from going down further on to her exposed womanhood. Last minute modesty was not going to save anything and my MD commanded her to leave his hand and open her legs and he mockingly told. There wasn’t a big enough crack along the sides of the shower doors to see in or out, for privacy's sake of course. So, my next option was to crouch down and under to see what I could witness below the stall door. Again, another few-seconds-long change of position that felt like hours. I got close enough to the bottom of the door while still being shielded by the actual wall of the stall. “Oh yeah… mmm… uhh… oh, Ben…”Ew. The sound of my brother’s name made this whole escapade a bit less. She moved closer.She slid her my hand from beneath her dress. “I make a lot of noise, if you have not noticed. You seem to be able to do a better job with control…..” I smiled and let her stat.She was good and she was discrete. She was also fucking nasty! She leaned closer and pointed out women throughout the room. “See the one over there, in the blue dress. Look at how big her boobs are! I bet she would make her husband pay you a thousand dollars to suck on one of her tits while he. I felt Abi's hair brush my cheek and realised she had started on the other one. I glanced across at her, only inches away from me. What a sight! Her little lips now fastening to Mum's other boob like a limpet as she sucked eagerly.I think Mum was enjoying it! She was now moaning with pleasure, muttering "Oh, my gorgeous babies! Oh yesss, that's beautiful! Oh my God, please don't stop!" and her hands were on the backs of our heads, pressing us down to her, urging us on. Then they were sliding.