In my mind I ran images of naked women, though mainly my sister, and I wondered how it would feel to be inside her, to make love to her, something Mom... probably wouldn't care to let me do, or even know I was thinking.I turned to where Mom was sitting in the chair beside the bed, watching me masturbate. My sister Kerri was laying on her stomach beside me, casually flipping through pages in some fashion magazine.No top on, so I could easily see the curves of her magnificent breasts as they pushed. He’s a motherfucker now! You like this, don’t you, lately? You’re turned on by women’s sluttiness, our naughty ways! You want Bianca, Natalie, and me to be wild, wanton women, don’t you? You’re not a subbie like Aaron ... you just get off on ... seeing ... ladies ... spread ... our legs ... and take it good and deep!” Mom groaned and panted ... as I continued hammering her slippery snatch and going deeper with each stroke.Finally, of course, it happened. I bottomed out inside Mom’s cavernous. “Christ, it’s big! Bigger than Jim’s” she gasped “And it is not even fully hard yet!” As it had just been released from it’s prison, my cock was not yet fully erect, it was bent over like a banana, the big head drooping at the end. “Looks like it needs a bit of help!” said Sarah as she started to unbutton her pyjama top. She started with the bottom button, slowly unfastening them all and then opening the top to reveal all.“What do you reckon.” She asked.“Not bad.” “Not fucking bad?? You cheeky. Her hair was short and she was what we called in those days pleasingly plump. She was also a very shy and introverted person so I suppose she was as surprised as I was when she turned into a round-heeled slut.As I mentioned, Carly was a mother. Our only child, Christy, was a nineteen-year-old college freshman at the local university. Carly and Christy were not only mother and daughter, but were also each other's best friend. They had no secrets from each other and this tight bond allowed.