Mom got up on the bed, straddled his legs and started to panty fuck him...grinding her panties against his. I was gonna cum and did, flooding my pant...es as quietly as I could I squeezed my legs together and just shook like I do...fuck I was horny! I left my hand where it was as I continued to watch the scene unfold before me...and what happened next actually schocked me most...playing together is one thing but.... Mom continued to grind with a purpose...both pair of panties were now really. Knowing Janis, I knew she wouldn't stay at the party very long and I would be home by ten. I might beat Patty home or I might not, but either way it would be a surprise to her.The party was a cocktail party put on by one of our customers in conjunction with a trade show that was being held at the downtown Hilton. It was being held in one of the hotel's convention rooms and there must have been a hundred people there. I was off to one side of the room standing with Janis as she talked to someone. 'I can hide in front of the dresser and blow him while he talks to mom.' "Oh, hi, Mom, what's up?" he asked her, peeking at her."Is your sister still in here?" Yes, she is still snoozing though," he answered, sweating his ass off.'Admit it; you love this. I'm giving you a blow job, but Mom has no idea. She can't see through your dresser. Now give me your load as I'm pleasuring you, David.'"Even with you yelling?" she pondered, pushing the door open slightly."No, Mom, don't come in here. I'm. She ran track in high school and in college. She worked out at least 4 times a week and watched what she ate. She loved looking good. She felt a little horny looking at herself. She had not had sex in over 6 months. She graduated college in Texas and moved to New York City soon after. She had a boyfriend, but he had no interest in moving to a big city. She dated on and off through high school and college. She was no slut, having sex only a handful of times in high school and only with.