Human Behavior Observation Experiment
Copyright© 2025 by danbaifen
Chapter 10
Incest Sex Story: Chapter 10 - That night, Allison had a nightmare. She dreamed that she had committed incest with her son and got pregnant and married, and people found out. Everyone called her a slut, a shameless bitch, and a beast... She screamed "No..." When she woke up, she was already in tears.
Caution: This Incest Sex Story contains strong sexual content, including Incest Mother Sister
Allison closed her eyes in despair, accepting the impending nightmare. As long as her daughter was safe ... as long as this family was still there ... what did it matter if she suffered a little? Wasn’t she here as a mother to atone for her sins...
Allison felt dizzy and a nauseous feeling rose in her throat. She couldn’t believe that her son would do such a rebellious thing.
Colin interrupted his mother’s thoughts impatiently and pulled her roughly into his arms.
“Stop being in a daze, open your mouth, I want to kiss you.”
Allison’s eyes widened in horror and she shook her head desperately, trying to avoid it.
“No ... This is ridiculous ... I’m your mother ... We agreed that you can’t force me...”
“Stop talking nonsense. You promised yourself.”
Colin sneered, pinched his mother’s chin, forcibly pried open her lips, and unceremoniously stuck his tongue in.
Allison whimpered in pain, tears blurring her vision. Her son’s tongue stirred in her mouth, with a strong smell of tobacco that made her sick. She pushed her son’s chest away powerlessly, but he held her tighter.
Colin kissed his mother forcefully, and at the same time, he grabbed her hand and placed it on the bulge under his crotch. He rubbed his hot cock against his mother’s soft palm through his pants.
Allison pulled her hand back as if she had been electrocuted, staring at her son in horror.
“Are you crazy ... your sister is in the room ... let me go ... go to my room...”
“Don’t be shy, mom. I’m your son and I’m so pent up.”
Colin smiled evilly, grabbed Allison’s hand again, and forced it under his crotch.
“Be good, help me touch it, I haven’t rubbed it for several days, I feel uncomfortable...”
Allison closed her eyes in despair and let the tears flow freely.
She trembled as she unzipped her son’s pants and pulled out the weapon that made her hate and fear him. As soon as the hot cock popped out, it jumped excitedly a few times and almost hit her face.
Colin panted comfortably and thrust his hips into his mother’s hands.
“Yes ... that’s it ... Mom’s hands are so soft...”
Allison wanted to find a hole to crawl into when she thought about masturbating her own son while her daughter was just one door away. But what else could she do to protect her daughter? She could only close her eyes and mechanically stroke her son’s thick penis, praying that he would release it quickly.
Colin rolled his eyes in pleasure. He thrust his hips quickly and thrust hard into his mother’s slender fingers.
“Mom ... I’m almost there ... Suck it for me, I want to cum in your mouth...”
Allison opened her eyes in horror and shook her head desperately to refuse. “No ... This is too disgusting ... I won’t...”
“I let you suck it!” Colin pinched his mother’s cheeks without giving her a chance to refuse, forcing her to open her mouth and stuffing his purple-red glans into her mouth.
“Don’t spit it out, swallow it all!”
Allison whimpered and knelt between her son’s legs, forced to assume the humiliating position of giving him a blowjob. She closed her eyes tightly, feeling the swelling and throbbing cock in her mouth, feeling hopeless. At this moment, Colin growled and shot all of his hot semen into her mouth.
The thick, smelly liquid made Allison cough. She subconsciously wanted to vomit, but her son covered her mouth tightly. Colin smiled evilly and ordered: “Don’t vomit, swallow it all! This is the essence of my son, mommy wants to taste it well~”
Allison looked at her son helplessly, closed her eyes in despair, and rolled her Adam’s apple a few times with difficulty before finally swallowing all the filth in her mouth. The fishy smell filled her mouth, making her want to vomit. However, what made her even more sad was that her dignity had been ruthlessly trampled by her own son...
Colin pulled out his limp cock with satisfaction and slapped his mother’s cheek with the saliva-covered glans.
“You are so good. Mommy serves her son so well. From now on, you have to sneak into my room every night and sleep with me. Do you understand?”
Allison nodded woodenly, looking ashen.
She knew that this was just the beginning of a nightmare. In order to protect her daughter, she had to sacrifice herself again and again and become a tool for her son to satisfy his lust ... But if she couldn’t even keep her own chastity, how could she protect her daughter?
Allison curled up on the ground in despair, letting her tears soak her clothes. Oh my God, what sin had she committed to deserve such punishment? Could she really hold on to her bottom line and prevent her son from succeeding? How long could she hold on before she completely collapsed?
Bitter tears blurred her eyes. Darkness swallowed her consciousness and dragged her into an endless abyss...
Ding Dong, that scary APP sent new instructions again.
Allison opened the message with trepidation, and read the lines of shameful text carefully. But ... how could this be possible?!
“Dear Allison, you are such a good and responsible mother. I am so moved that I almost cried when I saw you would rather serve your son than defile your daughter. As a reward, I will give you another simple task. Starting tonight, you have to wear your sexiest pajamas and sneak into Colin’s room. Remember, you have to wait until everyone in the family is asleep before you go, and you can’t let anyone find out. Then ... you have to lie down next to your son, hug him, and give him a sweet kiss. By the way, you are not allowed to wear underwear, you have to give your son a surprise. If you do well, maybe your son will let Ella go. Come on.”
Allison fell to the ground in despair, tears streaming down her face.
Oh my God, what kind of torture must she endure to get forgiveness? Why ... why must she force herself to do such a beastly thing?
But, for her daughter ... for the dignity of her family ... what other choice does she have?
Allison stood up shakily and walked into the bathroom like a zombie. She took off her clothes woodenly and let the hot water wash over her scarred body. In the mist, she vaguely saw herself in the mirror - haggard face, withered skin, and stretch marks on her sagging belly ... What was there to be nostalgic about this body? Why not give it to her son like this and make him smile...
Allison dried herself numbly, took out a silk suspender nightgown from the bottom of the closet and put it on. Her figure was much fuller than before, and it was tight everywhere. The fabric rubbed against her nipples and lower body, causing a tingling sensation.
She walked out of the bedroom barefoot, naked, almost in a self-masochistic manner, bowed deeply to the closed doors of her daughter and husband, and then tiptoed to the door of her son’s room.
Taking a deep breath, Allison gently opened the door and walked to her sleeping son’s bed, holding her breath.
My son’s sleeping face is so peaceful, like an innocent angel.
But Allison knows very well what kind of venomous heart is hidden under this face...
Allison gritted her teeth and climbed onto her son’s bed, carefully lifting the covers.
Colin was only wearing a pair of underwear, and his young and strong body exuded seductive heat in the darkness.
Allison swallowed hard, leaned down slowly, and gently hugged her son’s strong waist. The thin silk nightgown could not block the touch of skin to skin, and her son’s body temperature instantly ignited her.
She closed her legs in shame, but couldn’t stop her lower body from flooding.
Colin was instantly awakened by his mother’s sudden warmth and tenderness.
He opened his eyes in surprise, only to see Allison lying in his arms with a look of despair on her face, her body trembling.
“Mom ... why are you here?”
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