Human Behavior Observation Experiment
Copyright© 2025 by danbaifen
Chapter 19
Incest Sex Story: Chapter 19 - 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
As expected, Allison soon became pregnant.
She sat in front of the dressing table, stroking her slightly bulging belly, and couldn’t help but smile happily.
Since the day she found out she was pregnant, she has been feeling uneasy.
On the one hand, she was happy that she was finally pregnant with the child of her beloved, but when she thought that the father of the child in her belly was actually her own son, she felt deeply guilty and remorseful.
How could she feel that she had committed incest with her son and got pregnant with his child?
Colin looked beaming with joy, as if this child was a great pride to him.
From the day he learned that his mother was pregnant, Colin has been almost always by her side, taking good care of her.
He bought a lot of beautiful and sexy maternity clothes for his mother, but unfortunately she couldn’t wear them during the day because he was afraid that Ella would find out.
Only at night, with the bedroom door closed, did Allison dare to put on those revealing dresses and show her charm in front of her son.
After she became pregnant, her body became more sensitive and she would become aroused by the slightest teasing from her son.
However, Colin did not allow his mother to wear underwear, saying that he wanted to give the child space to grow freely.
As a result, Allison’s plump breasts were always shaking under the thin maternity skirt, and her huge nipples pushed up the fabric, which was extremely obscene.
Colin simply loved the way his mother looked.
He always rushed to his mother as soon as he entered the bedroom, pulling off her dress to reveal her naked body. Allison’s skin was whiter and more delicate than usual during pregnancy, exuding the unique charm of a mature woman.
Colin kissed and caressed his mother’s towering breasts while lovingly stroking her bulging belly.
“Mom, you are so beautiful carrying my baby.”
Allison blushed and said angrily, “You little rascal, you dare say that. You and the baby in your belly are driving your mom crazy.”
“That’s great, let us torment you again.”
Colin smiled evilly and spread his mother’s long legs.
The body of a pregnant woman is extremely sensitive and thirsty. Allison’s vagina has long been flooded with spring water and is in urgent need of her son’s nourishment.
Colin leaned over and kissed his mother’s petals devoutly, prying open the flesh with his tongue, stirring and sucking inside. His flexible tongue tip teased Lu Qingyun’s engorged clitoris, stimulating her to tremble all over and moan continuously.
“Ah ... son ... don’t ... it’s dirty there...”
Allison resisted, but her body honestly responded to Colin’s lips and tongue.
Her son’s superb oral skills made her feel extremely happy, and she screamed and orgasmed not long after.
Colin straightened up with satisfaction and rubbed his hard cock against his mother’s wet hole.
“Mom, you’ve already climaxed, but your son hasn’t ejaculated yet. It’s my turn to enjoy it.”
As he spoke, the thick glans pushed open the mother’s labia and slowly pushed into the already muddy secret path.
Allison’s pussy was wet and hot, sucking her son’s penis tightly, making his scalp tingle with pleasure.
“Oh ... my son’s cock is so big ... Mommy is going to be broken...”
Allison moaned and wrapped her legs around her son’s thin waist.
Colin swung his strong hips and thrust hard. The thick and long meat blade broke through the layers of tender flesh and penetrated deep into the honey hole.
Allison was gasping for breath as she was pushed hard, the pleasure flooding through her body like a tide.
“Fuck me ... fuck me hard ... Mommy is yours alone...”
She had completely thrown away her reserve and was moaning wantonly.
“Cum for me ... cum inside me ... let me give you a daughter...”
Colin was aroused by his mother’s obscene words and became more excited, thrusting faster and harder.
Allison’s white buttocks were slapped by her son’s hips, and her white breasts bounced up and down with the rhythm. She soon reached the peak again under her son’s wild attack, and her uterus spasmed violently.
Colin felt the contraction of his mother’s vagina, growled, and thrust violently for dozens of times, finally shooting all of his hot semen into his mother’s body.
Allison collapsed on the bed, her eyes dazed, her body overwhelmed by the pleasure of the creampie.
Afterwards, Colin held Lu Qingyun in his arms tenderly and stroked her hair gently.
“Mom, do you think our baby is a boy or a girl?”
Allison shook her head. “I don’t know either, but this is my child and yours. I will like it whether it’s a boy or a girl, because I love you...”
“Guess what?”
Colin said while touching his mother’s breast.
Allison thought for a moment and said, “Maybe it’s a girl ... When mom was pregnant with you...”
Speaking of this, I suddenly blushed. Who would have thought that the little thing in my belly more than 20 years ago would make me pregnant again?
“Go on, Mom.”
“When I was pregnant with you, you were always kicking around in my belly during this month. When I was pregnant with your sister, you were very quiet. Our baby is very quiet, so I guess it should be a daughter...”
Colin touched his mother’s belly and said softly, “Hello, daughter.”
Allison nodded, beads of sweat still on her forehead from making love.
She looked at her son gratefully and gradually fell asleep in his arms...
After becoming pregnant with her son Colin, Allison became more and more attached to him.
Every night, after closing the bedroom door, she would put on revealing maternity clothes and show off the charm of a mature beauty in front of her son.
Tonight, she wore a pink suspender dress, her large breasts pushed the fabric up and swayed as she walked. As soon as she entered the bedroom, Colin rushed over, pushed her down on the bed, and tore off her dress.
“Mom, I can’t stand it anymore, let me fuck you to death!”
Colin kissed his mother’s fair skin and spread her legs impatiently.
Allison blushed and panted, “Son, be gentle ... I’m pregnant...”
“Never mind, you are already mine.”
Colin pressed his thick cock against his mother’s wet petals and slowly pushed it in.
“I’m going to fuck you until you get pregnant with your second child, and I’m going to fuck you until you can’t get out of bed!”
“Ah ... the penis is so big ... be gentle...”
Allison moaned, but she wrapped her legs around her son’s waist.
The pussy was filled up completely, and every inch of flesh tightly gripped her son’s penis.
Colin thrust rapidly, his thick, long penis vigorously stabbing his mother’s vagina.
“Mom, do you feel good when your son fucks you? Scream louder!”
“Ah ... son ... you make mommy feel so good...”
Allison screamed in pleasure, her plump body shaking.
“You ... you are going to fuck your mother to death...”
“Yes, I will let you die on your son’s cock tonight!”
Colin thrust even harder, pulling out almost the entire thing each time before thrusting hard all the way in.
“Ahhh ... I’m going to die ... I’m really going to be fucked to death...”
Allison cried incoherently, the overwhelming pleasure almost made her collapse.
“Fuck me to death ... son ... Mom is yours alone ... fuck me however you want...”
“Bitch! Slut!”
Colin growled and slapped his mother’s snow-white buttocks.
“Call me daddy! Shout loudly!”
“Daddy ... oh oh oh ... Daddy’s big cock is fucking me to death...”
Allison screamed, unable to control herself any longer, and actually called her son “Dad”.
The movements of mother and son became more and more intense; the sound of flesh colliding and the gurgling sound of water filled the entire room.
At this moment, the bedroom door suddenly opened. Ella stood at the door and looked in surprise at her mother and brother who were entangled naked on the bed.
“Mom ... Brother ... what are you doing?”
The girl’s incredulous eyes were filled with shock and astonishment.
Allison was so scared that she quickly pushed Colin away and hurriedly pulled the quilt to cover her body.
“Ella ... let me explain...”
“That’s enough!”
Ella was furious. She pointed at her mother’s bulging belly and asked harshly, “The baby in your mother’s belly is not your father’s, right? I knew there was something wrong with you!”
Allison was so ashamed that she stammered and couldn’t speak.
Colin was not in a hurry. He walked up to his sister and said casually, “You think too much. The baby in mom’s belly is dad’s child.”
Ella would never believe such nonsense, but she was too discouraged to ask any more questions.
Finally, she glared at her mother and brother, slammed the door and left.
Only the mother and son were left in the room, staring at each other.
Colin gently hugged his mother and comforted her: “Don’t be afraid, things will eventually pass. No matter what, I will face it together with you, mom.”
Lu Qingyun snuggled in her son’s arms, feeling confused. Her daughter’s suspicion made her feel like a thorn in her side, but deep down, she knew that she couldn’t turn back. She fell deeper and deeper, and fell hopelessly in love with her own son, even if she was punished by God, she didn’t care.
Colin gently kissed away the tears on his mother’s face, and his lower body swelled again. “Good boy, Mom, let’s continue and finish what we didn’t finish just now...”
Allison blushed and opened her legs to welcome her son’s entry again.
The daughter’s matter was temporarily forgotten. At this moment, she only had the supreme pleasure her son brought her. She moaned and panted shamelessly, her snow-white body was kneaded by her son, and her body and mind once again surrendered to her son’s crotch.
Colin thrusted fiercely, as if he wanted to rub his mother into his body.
The hot glans pushed open the opening of the uterus again and again, and Allison cried and screamed, reaching one climax after another.
The mother and son cling to each other, and at this moment, there is no one else in the world but each other...
Allison slumped limply on the bed, her pussy filled with her son’s semen.
The scene of her daughter discovering the affair was still vivid in her mind. What should she do? She hugged her son tightly, as if he was holding on to a life-saving straw. Her son was now her backbone, and she could only pin her hopes on him.
The next morning, when the first rays of morning light shone into the bedroom through the curtains, Allison woke up slowly.
She found herself lying naked in her son Colin’s arms, their lower bodies still tightly connected.
The scene of her daughter Ella catching them having an affair last night was still fresh in Allison’s mind. She was so ashamed that she wished she could find a hole to crawl into.
“Good morning, Mom.”
Colin woke up and whispered affectionately in his mother’s ear.
His broad hands restlessly touched his mother’s towering breasts and began to knead them gently.
To read the complete story you need to be logged in:
Log In or
Register for a Free account
(Why register?)
* Allows you 3 stories to read in 24 hours.