Human Behavior Observation Experiment
Copyright© 2025 by danbaifen
Chapter 18
Incest Sex Story: Chapter 18 - 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
“Mom, forget about him and enjoy our new life. From now on, this family will only have us and our children.”
Speaking of children, Lu Qingyun’s face turned red.
“What kind of child is this...”
“Our child! I ejaculate so much into you every day, you should have been pregnant a long time ago.”
Colin looked at his mother with a smirk.
“screw you...”
Allison patted her son lightly: “I told you to wear a condom, but what if you really get pregnant...?”
“What’s so difficult about that? Just say it’s Dad’s.”
Colin said casually, “Anyway, Dad has acquiesced, no one will doubt it.”
Allison blushed and sobbed quietly in her son’s arms.
She felt extremely embarrassed and humiliated when she thought about having to deal with two men, her husband and her son, and the risk of getting pregnant at any time.
But she had no choice. From the moment she had sex with her son, she was destined to fall into this abyss from which there was no escape.
Colin seemed to see through his mother’s thoughts and hugged her tighter.
“Don’t worry, mom. I’m here and I won’t let you suffer any injustice.”
He suddenly gave a wicked smile, “Besides, haven’t you always wanted to have another daughter? Now is the perfect time for me to satisfy you~”
Allison felt so embarrassed that her whole body was burning with embarrassment, and she wished she could find a hole to crawl into.
She glared at her son in reproach and said sullenly in his arms: “Bad boy, you are so imaginative...”
Colin chuckled, and his big hands restlessly reached into his mother’s clothes, grabbing her plump and soft breasts and kneading them.
“Mom, this place is so big, it will definitely be able to feed our daughter in the future~”
Allison screamed and pushed her son’s hand away in panic.
But Colin didn’t care about that. He simply picked up his mother and strode towards the bedroom.
“Son, what are you doing ... put me down...”
Allison pounded her son’s solid chest in shame and anger.
Colin kicked open the bedroom door and gently placed his mother on the soft big bed. “Of course we have to do business. Mom, don’t you want a daughter? I’ll create one right now~”
In the quiet night, a mature and beautiful woman sat alone at the dining table, with a somewhat anxious look on her face.
Her face is delicate and beautiful, her skin is as soft as a baby’s, her eyes are full of affection, she is full of charm, tall and plump, with a well-proportioned figure, big breasts and round hips, and she is enchanting and sexy. At this moment, she is wearing a white silk suspender nightgown, which is half-covered, and her cleavage and thighs are vaguely visible. The deadly and seductive perfume smells from her neck and behind her ears, and there is a faint milky fragrance from her cleavage. Her private parts also smell good because they have just been washed.
Allison sat at the dining table feeling upset, and even a glass of red wine could not calm her down.
Just now, her daughter Ella inadvertently asked about her recent relationship with her son. Although she tried her best to conceal it, her daughter still keenly noticed the abnormality.
“Mom, has something happened between you and my brother recently? You two are always alone together, flirting with each other.”
Ella asked suspiciously.
“What nonsense are you talking about! What could possibly happen to your mother and your brother?”
Allison fumbled around and looked away guiltily.
“But I always feel like you’re hiding something from me. Ever since dad suddenly said he wanted a divorce, you’ve become very strange.”
Ella narrowed her eyes, as if observing her mother’s reaction.
Allison’s heart skipped a beat and she stood up hastily, “It’s okay, Mom is busy.”
Allison hurriedly escaped from her daughter’s sight, stumbled into the study, and hugged Colin who was reading.
Colin put down his work and hugged his mother in his arms.
He stroked his mother’s back and whispered in her ear, “What’s wrong, Mom?”
Allison repeated the conversation, her tone full of worry.
“What should I do, son? Your sister seems to have noticed something. If she knew about us...”
Colin hesitated for a moment and said firmly, “Don’t be afraid, Mom. Even if my sister finds out, so what? We haven’t done anything wrong. Besides, Dad has acquiesced. What can she say?”
Allison shook her head, tears welling up in her eyes.
“But ... this is incest after all. If your sister knew about this, she would hate me to death.”
“She won’t.”
Colin held his mother’s face in his hands and looked directly into her eyes.
“My sister loves you the most. No matter what happens, she will stand by your side. Besides...”
He suddenly smiled evilly, “If we really can’t hide it, why don’t we drag my sister into this and let her join us~”
“What nonsense!”
Allison glared at him angrily and punched him in the chest.
“Ella is your biological sister! You pervert!”
“Just kidding~”
Colin kissed his mother’s cheek flatteringly.
“Don’t worry, mom. Let me handle it. I will try to hide it from Ella and never let her find out about our relationship.”
Allison sighed and leaned weakly into her son’s arms.
She knew that worrying would be useless, so she could only follow Colin’s arrangements.
But she vaguely felt that it was only a matter of time before her daughter found out.
Ella’s university is on summer vacation during this period, so she has to stay at home for a month.
This was a tough time for the mother and son. They usually had sex several times a day but were suddenly forced to stop being intimate. They looked at each other with eyes as if fire was coming out of them, but they had to behave like normal mother and son in front of their daughter.
All we can do is sneak around and seize every available opportunity to have fun.
At this moment, Allison was kneeling in the narrow space under her son Colin’s desk, her naked body trembling slightly because of nervousness and excitement.
She opened her mouth wide and struggled to suck her son’s thick and long cock. Her small mouth was so full that she could hardly close it.
Colin sat at his desk, typing on the keyboard pretending to be calm, but the pleasure coming from his crotch made it almost impossible for him to concentrate.
His mother’s hot and wet mouth tightly wrapped around his penis, and her clever tongue kept licking the sensitive glans, making his scalp numb with pleasure. He looked down and saw his mother’s snow-white and plump body curled up under his crotch, her beautiful face was deformed by his big cock, and the extremely obscene scene made him even more excited.
Suddenly, the door was pushed open and the sound of footsteps was heard.
It’s Ella!
Allison panicked and subconsciously tried to get up, but Colin held the back of her head and forced her to continue sucking.
“Brother, have you seen mom? I’ve been looking for her for a long time.”
Ella looked around and asked suspiciously.
Colin tried to remain calm and said, “No, my mother might have gone out to buy something.”
Allison became more nervous when she heard her daughter’s voice. Her throat contracted involuntarily, tightly gripping her son’s huge glans.
“But I always feel like my mom is at home. She’s been avoiding me lately. It’s so strange.”
Ella muttered, looking around.
Colin was so ecstatic by his mother’s little mouth that he was afraid of moaning, so he gritted his teeth and said, “Don’t think about it. Mom loves you the most, how could she hide from you? Go to the living room and wait. I’ll ask her to find you when she comes back.”
Ella nodded doubtfully and walked out reluctantly.
Allison felt relieved, spit out her son’s cock, and gasped.
She glared at Colin in shame and anger, her sweaty body pressed against her son’s legs.
“You bad boy, you were almost discovered by your sister! If she knew that your mother was giving you a blowjob, she would be furious.”
Allison scolded.
Colin smiled lewdly and pinched his mother’s buttocks, straightening his waist: “Then don’t let her find out. Be good, suck deeper, your son is about to cum.”
Lu Qingyun blushed, feeling embarrassed and annoyed, but she had to continue to lower her head and serve her son’s cock.
The little mouth sucked vigorously, the tip of the tongue stimulated the urethra from time to time, and the palm of the hand stroked the shaft.
Colin sighed with pleasure and quickly reached a climax thanks to his mother’s skilled oral skills. He growled and shot his hot semen into his mother’s mouth.
Lu Qingyun swallowed hurriedly, but a few drops still overflowed from the corners of her mouth. She knew her son’s preferences, so she scraped the semen from the corners of her mouth with her hands, put her fingers into her mouth, and sucked it all in.
Before they knew it, the mother and son had been maintaining an incestuous relationship for three months.
One day, Colin went out to do some work. When Allison was tidying up his study, she accidentally found a notebook with the words “Sex Diary with Mom” written on it.
Curiosity drove her to open it, and as she turned the pages, she was shocked to find that it contained dense records of the details of every sexual intercourse between her and her son.
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