Human Behavior Observation Experiment
Copyright© 2025 by danbaifen
Chapter 17
Incest Sex Story: Chapter 17 - 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
“Ah ... son ... be gentle...”
Allison begged in despair.
When Colin heard this, he became even more excited and pounded his mother’s vagina fiercely.
The long skirt was lifted to the waist, and the towering breasts swayed in the low-cut dress.
The violent movement caused one of her breasts to break free from its restraints, exposing the snow-white hemisphere to the air, and the ruby necklace adorning it was dazzling.
Colin took his mother’s nipple into his mouth and sucked and bit it hard.
Allison couldn’t hold it in any longer and screamed as she reached her climax.
“Mom, you look so beautiful tonight.”
Colin bit his mother’s earlobe while thrusting forward. “Seeing those men coveting you, I want to fuck you in front of them until you call me husband.”
“Then you ... should ... hurry up...”
Allison urged with a blushing face, raising her buttocks to cater to her son.
Hearing this, Colin worked even harder, and after a few hundred strokes, he ejaculated inside his mother with a low roar.
The hot essence hit Allison’s clitoris, causing her to reach another small climax.
After her climax, Allison collapsed in her son’s arms, feeling his presence inside her.
Suddenly, footsteps were heard outside the door and someone was approaching.
Allison hastily pushed her son away and frantically tidied her appearance.
Colin was also a little flustered. He pulled up his trousers and put his suit jacket on his mother to cover her messy clothes.
There was a knock on the door. Allison took a deep breath and walked over to open the door as calmly as possible.
There were two staff members standing outside the door, looking at the man and woman in front of them suspiciously.
“Excuse me ... are you Allison? We are here to deliver a gift.”
“Ah ... it’s me. Sorry to bother you.”
Allison took the gift box in a panic and felt her face burning.
Colin behind him took over the conversation at the right time: “Allison is feeling unwell. I’m her assistant and I’m just about to take her home.”
The staff nodded doubtfully and left politely.
Allison let out a long sigh, looked at Colin, and then couldn’t help laughing out loud.
“Let’s go home.”
Colin took his mother’s hand and kissed her forehead tenderly.
Allison nodded and leaned into her son’s arms, feeling extremely satisfied and at ease.
“No matter if he is my son or my lover, at this moment, I just want to be with him forever...”
Allison was deeply conflicted.
Reason told her that this was not going to work, and that the truth would be revealed one day. But her feelings made her willing to sacrifice everything for her son, even her reputation and dignity. She knew that she could not go back, and could only sink deeper and deeper into the abyss of desire...
The days of sweet love went on day after day, and the mother and son became more and more affectionate. During the day, they went to work separately, and chatted with each other on WeChat during the breaks. At night, they returned home and had fun every night, greedily demanding each other’s bodies.
It was just another ordinary night. Allison blushed as she knelt on the bed, her raised buttocks completely exposed to her son.
The two white and plump buttocks trembled slightly with her breathing, and the pink anus in the middle opened and closed, as if inviting her son to enter.
Colin used his hands to spread his mother’s buttocks, and pressed his thick and ferocious glans against the delicate flesh hole. He smiled obscenely and said, “Good mother, lift your buttocks higher, let your son think about which hole he wants to enter first today~”
“Bad guy! Come in quickly ... Mom wants...”
Before the mother could finish her words, Colin rammed his dick deep into her anus!
The penis as thick as a child’s arm instantly stretched the narrow anus, and the severe pain of the intestine being forced open made Allison scream.
She begged with tears in her eyes: “Bad son ... you come in so fast ... it hurts...”
“Relax, Mom, you’re too tight.”
Colin gritted his teeth and said, his powerful hands tightly clamped his mother’s thin waist, and the huge glans squeezed into the narrow and deep intestine inch by inch. That place was rarely used and was now tightly squeezed.
The hot inner wall was like a small mouth, sucking Colin’s glans, making his scalp tingle with pleasure.
Finally, with a low roar, Colin went all the way in, his thick and long penis completely inserted into my mother’s anus. His round and plump sac slapped against my mother’s flower lips, making a lewd sound of “pa pa”.
The pain gradually faded away, and the familiar numbness and itchiness spread from the anus to the whole body.
Allison whimpered helplessly as she felt her son’s huge cock slowly pull out and then ram back in, each time reaching deep into her intestines.
Colin seemed to be particularly fond of this forbidden area. His penis kept stirring in the intestines, grinding the most sensitive spot of his mother at different angles.
Allison couldn’t stand such stimulation and soon she screamed and climaxed.
The spasming intestines tightly gripped his son’s penis and sucked it like a small mouth.
Colin’s scalp was tingling with pleasure and he started thrusting even more frantically.
At this moment, the door of the living room was suddenly pushed open, and a drunken voice came: “Wife, I’m back~ Hey, you’re a big star now, it’s time to give some money to your husband...”
Allison was terrified when she heard the voice! It was her gambling husband Evan!
Why did he come back today?!
Seeing her husband about to enter the house, Allison ignored her son’s sprint behind her, and hurriedly pushed him away and tried to put on her clothes.
But she was so weak all over that she had no strength to resist. Colin’s penis was still buried deep in her anus, moving in and out as she struggled.
“You’re crazy! Pull it out! Your dad is coming in!”
Allison spoke incoherently, tears streaming down her cheeks.
“I won’t. Who allowed him to disturb us?”
Colin pressed his mother under him, pulled out his cock, aimed it at her ravaged pussy, and thrust it hard.
At the same time, Evan stumbled into the bedroom and was stunned by the scene in front of him: his dignified and virtuous wife was being pressed down by his own son and fucked wildly, the two naked bodies overlapped together, and their lower bodies were tightly connected...
The air was filled with a lustful smell that made people blush.
“Wife?! Son?! What ... what are you doing?!”
Evan roared, rushing forward to grab his son.
Colin pushed away his father who was still in shock and stood in front of his mother.
Evan staggered a few steps, shaking with anger, and pointed at his son and cursed:
“You unfilial son! How dare you rape your own mother! I have lived in vain with a son like you! I will kill you!”
He rushed out angrily, as if he was really going to find the guy.
Allison turned pale with fear and grabbed Colin’s arm: “Son, what should we do? Your father...”