It was inevitable. Your mother's thighs were long and smooth, her skin flawless, with well-trained firm muscles. And robbed of the confining safety of your diaper, your undersized penis was making direct skin-to-skin contact with them. Every slap on your upturned bare bottom jostled your entire body against her lap, forcing the sensitive underside of your penis to rub against your Mother's lovely athletic thighs.
Despite the stinging, burning pain of your Mother's hand slapping mercilessly against your unprotected buttocks, the tears streaming down your face, and the deep sense of shame welling up as you were subjected to this humiliating, emasculating punishment in front of your girlfriend and her mother, your body was reacting to the sensation whether you wanted it or not.
Your penis, stimulated by the rubbing of welcoming feminine flesh, seemed to instinctively know that it was near a womanly vagina, and had thus been fooled into thinking that it must be engaging in the sexual act. It neither knew nor cared that your "partner" was your own Mother and that this was not the masculine act of copulation, but rather a pathetic and disempowering punishment meant to humiliate you.
Your penis was always extremely sensitive to touch anyway, whether it be the gentle caresses of your your own naughty fingers, the soft, safe confines of your diapers rubbing against you; or, when you were very good, your girlfriend Kay's hairless pink pussy. But against your Mother's muscular thighs you had no defense. What was more, unlike your diapered, flat-chested girlfriend, your Mother was tall, athletic, and regal, with full, pendulous breasts that even now were dabbing against your back with each spank. She was an Amazonian queen, a vision of beauty and sexuality that your ridiculous little lover could never hope to equal. Anyone would tell you that your Mother was worthy of intense and devoted desire... but none of them were her son. For you to have such feelings would be deeply, unforgivably shameful. Perversion of the worst degree.
So your Mother had often reminded you when she caught you getting a stiffy in her presence, and especially from those times when she'd been forced by circumstances (as she put it) to directly touch your eager, sensitive little penis.
Now, her spanking was forcing your eager, sensitive little penis to hump and grind against her thighs. And with a rising panic, you felt that deep welling of tightness and tension building in your scrotum. There was no way you would be able to last through this spanking without committing a deed of supreme shamefulness.
"M-Mommy, please, no more!" you sobbed, your desperation making your voice crack. "Please stop, I'm gonna..." You couldn't get yourself to say the words aloud, especially with Kay and her mother Crystal watching you receive your punishment.
"You said you wanted to take Kay's punishment for her," your Mother reminded you in a casually cruel voice. "No backing out now, or do you want poor little Kay's bottom to be as red as yours?"
"I doubt Kay would think of you as her hero if you chickened out now, Petey," Crystal said with a bemused smirk. "Do you think my daughter wants to spread her legs for a cowardly little boy?"
Kay's face flushed bright pink. Due to her pale skin and red-haired complexion, she was helpless to hide even a little bit of blushing. But she maintained eye contact with you, looking at you with a mixture of compassion and admiration, as if wordlessly urging you to endure the pain and shame until the end, but also a note of fear, as she really didn't want to be experiencing the spanking you were receiving.
It proved to be too much stimulation for your poor sensitive dickie to endure. Kay maintaining eye contact with you even as you were at the height of your shame, Crystal mockingly referring to her daughter's status as your sexual partner, and your Mother's irresistible athletic thighs rub, rub, rubbing against your diminutive erection with each buttock-stinging spank, all combined to trigger your uncontrollable climax. Your penis, stimulated beyond its capacity, understood its purpose in copulation, and ejaculated your hot semen into what it apparently believed was a vagina.
Your skinny body shuddered all over as your orgasm overpowered you. You ejaculated again and again and again, and your groin and belly was rapidly coated with your slimy goo, making your body slide against your Mother's thighs instead of just rubbing with each spank. The pleasure that went through you was intense enough to make you dizzy, and for a brief moment as darkness ringed your vision, all that mattered was that you were cumming so very hard.
In that moment, your shameful knowledge that you were cumming for your own Mother only intensified the erotic ecstasy you experienced.
But all good things must come to an end, and your consciousness fell back into the humiliating circumstances of your predicament all too soon. You became aware that your Mother's palm was now resting on your reddened bare buttocks. You were aware that she was breathing harder, due to the exertion of spanking you.
"All finished?" Crystal asked. She sounded disappointed.
"I..." your Mother stammered. Never before had your Mother seemed at a loss for words. She licked her lips and said, "Peter, stand up, please. I need to see your penis."
You felt the heat of your blushing burning your face with nearly the heat of your freshly-spanked bottom. You were reluctant to stand up, but you knew that you wouldn't be given a choice. Meekly you slid off of your Mother's lap and stood before her. Her long, toned, Amazonian thighs were liberally coated with a milky slickness, bubbly and foamy in places, watery and trickling down her inner thighs, and making her leg muscles glisten. Your Mother looked down at her lap for a moment, then glared at you.
"Peter!" she said, raising an immaculate eyebrow. "Did you just ejaculate on my lap?" Though her voice retained its usual authoritarian tone, her cheeks were flushed. Was it merely the exertion of spanking you? No, she was far too fit to even break a sweat from giving you a spanking.
Crystal burst into laughter. "Oh, no," she said between guffaws, standing up to inspect the gooey sticky mess you left on your Mother's legs for herself. "Awww," she sing-songed, looking at you and grinning, "someone got so excited that he made cummies for his own Mommy. How dirty is that? And right in front of your girlfriend, too! What a pervert!" She looked down at Kay and said, "I'm sorry honey, it looks like you're not going to get pee-pee in your cunny today. Your brave little boyfriend wanted to spurt for his own Mother."
Kay looked at you wide-eyed, her blush spreading all the way down to her barely-there breasts. Tears welled in her eyes and she subconsciously began to rub her diapered crotch from sheer frustration.
"What am I going to do with you, you naughty little leg-humper?" your Mother said, glaring at you as cum dripped from the tip of your softening little penis.
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