A Stepmother's sin - Ch 8 - Robert returns to college - the end of a wonderful summer: - Sex Stories

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A Stepmother's sin - Ch 8 - Robert returns to college - the end of a wonderful summer:

Date: 11/18/2017, Categories: Taboo, Author: submissivemom72, Rating: 9, Source: LushStories

I was in shape. I was very glad I had spend all the time I at the gym on the stair-stepper that I had. I stood up as high as I could, but that still left about 3 to 4 inches of this huge vibrating phallus inside of me. Then I would lower myself as quickly and far as I dared. Each plunge downward evoked another involuntary grunt. But each plunge down gave me a shot of pleasure deep into my womb that encouraged me to try to go a little faster, and a little deeper next time. “God mom, you are taking so much of that inside you. You are so damn sexy, mom. I love you. I love you. Thank you for doing this for me.” My baby knew I was fucking this huge toy for him. And I was going to make myself cum for him. And I was going to show that him I could; that I could fuck this hue toy and cum on it. I was determined to make this happen for both Robert and me. I lowered myself as far as I could, pushing down with a guttural grunt. “Oh baby this thing is so big. Do you have any idea how deep this thing is stuck inside your mommy’s pussy?” “Tell me how deep, mom. How deep is it inside you?” His penis was arching forward in a throbbing motion, indicating that he found this very stimulating. And as always, his excitement increased mine. I pointed to my abdomen, an inch or two above my navel. "Baby, I feel the head all the way up here!" Robert’s penis pulsed as I pointed to my belly. “Baby, come here. Let momma help you with that.” Balancing myself by placing my hands between legs, pushing down ... on the wooden seat which the vibrator’s suction cup was attached to give me leverage as I rode myself closer and closer to orgasm with each plunge. Robert walked over to me and presented me with the finest penis, the most beautiful erection I will ever see. Holding his stiff rod with one hand, as I continued to balance myself with my other hand, I took his rigid penis into my mouth as I pushed as deep as I could the vibrator. “God mom, you are taking that entire vibrator.” “ I know baby.” I moaned as I pulled his erection into my mouth. I started bouncing more rapidly and more violently, sensing my orgasm was imminent and, at this point, unavoidable. I was going to cum for my boy, there was no stopping me now. Each stroke caused me to groan loudly around Robert’s penis which was pulsing on my tongue and lips. “Oh, baby, I am cumming,” I said taking Robert from my mouth just long enough to convey the message. It must of have been the excitement of my orgasm that triggered Robert’s. “Oh God, mom, so am I, mom.” I felt and tasted the first of a series of eruptions from Robert’s throbbing penis. I sucked, and I swallowed, and I sucked some more as I continued to impaled myself as deeply as I could on ‘big red’. I felt like I was placing my entire weight on this vibrator, pushing it as deep as it would go. There was simply no more room in my pussy. I was bottomed out. I swallowed three times and Robert’s penis was still dribbling his semen into my mouth. I continued to softly suck ...