Shuddering I got up and made my way to the bath room to clean up. Turning on the light I winced. Shit that was bright, squinting I looked in the mirro... and saw the evidence of my orgasm. Three trails of cum were making there way down my stomach. My semi erect cock seemed to be laughing at me. Jacking off had only given me a moments relief, I was still hard thinking about her. There was only one way to have my constant erection to go away and that was to fuck my little sister. Scrubbing a hand. I could also see her nipples full and hard. I reached down between her legs to find it wet just like her mother.I walked back to her mother and placed my fingers under her nose. I then whispered into her ear, “She might be as much as a slut as you are. You know, I‘m going to find out. Don’t you?” There was resignation in her eyes as she nodded. “Can I take the gag off of you? Will you be a good slut and say nothing about this until Monday?”She nodded her head.I told her “Good girl” as I removed. I'll be itching all night." But it looks so good on you." Yeah, but it feels awful." You can scratch when you get home. It's just one night and you'll look terrific."What I thought were compelling, logical arguments had been rebuffed. We had to leave in ten minutes. It would be uncomfortable but not painful. Was this the time and the reason to draw a line in the sand?"Yes dear." Bitch.That's not the always the way it goes. There is another popular variation."All right, wear whatever you. Then i put her for doggy position and she obliged and entered from behing. after 1 minute of pumping and i was also spanking her. her ass was wonderful . she had her 2nd orgasm. and after 2 minte i had mine. i ejected for around 2 minutes and then she removed condom,, it was filled to neck with my cum. she cleaned me and we rested for 5 mins. i asked her if i can fuck her on ass. she said she hadn’t tried it. i told her it would be fun.I asked her too put another condom. she said what is need.