ONYX FICTIONMother's Birthday Gift: The Hidden Downfall in the Mother-Son Forbidden Diary
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Mother's Birthday Gift: The Hidden Downfall in the Mother-Son Forbidden Diary

♙ Anonymous◷ 2026-08-19◉ 0
Family Incest

After the mother discovered her adult son's incest diary, their long-suppressed desires completely erupted. The mother proactively put on sexy lingerie and offered her body as a birthday gift. Under a secret agreement, they maintain their mother-son identity during the day, but at night, they sink into forbidden physical entanglements, each union filled with stimulation and an inseparable familial bond.

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When Xiaojun woke up, morning light was already filtering through the curtains onto the sheets. The lingering sensation from last night remained in his lower body; he instinctively reached down and found himself hard again.

The scene from last night was as clear as if it had just happened. Mother knelt between his legs, using that mouth usually gentle and dignified, taking his penis in and out, again and again. The squelching sounds, her slight throat noises when swallowing semen, and those few lines she left in the diary before leaving were all still swirling in his mind.

He sat up and saw the diary spread open on the desk. On the new page, in Mother’s elegant handwriting, it said:

"The videotape from yesterday was pretty good, but that mother and son in the end were too stupid. No one knew about it, so why commit suicide? All that talk about ethics and morality is just lies people tell to comfort themselves. Don’t you think so? If I were that mother, I’d change my name and identity, take my beloved son and run far away, to a place where no one knows us! Mom’s going to work. Come back early at noon; Mom wants to give you a birthday present."

Xiaojun stared at those lines for a long time, his heart pounding. His mother's thoughts were bolder than he had imagined. She had even thought about the aftermath, so what was he hesitating for?

He washed up quickly and ate something simple, but he just couldn’t calm down. The clock ticked forward one notch at a time, and he almost stared at the hands until noon. As soon as the time came, he rushed home like flying.

Pushing open the home door, a pair of familiar high heels belonging to my mother were placed at the entrance. She had returned early.

Passing by the master bedroom, a note was stuck on the door: 'Xiao Jun, push the door open, the gift is inside the room.'

He took a deep breath and pushed the door open.

The light in the room was softened by the curtains. The woman reclining on the bed wore a bright red bikini-style lingerie set; the semi-transparent fabric hardly concealed anything. The bra was tie-front, and the panties were held in place by just two thin strings. She wore light makeup, her hair slightly curled, her eyes seductive enough to drip water.

Xiaojun froze in the doorway.

「Xiaojun, don’t you recognize Mom?」 Mother’s voice carried a smile, but it was much softer than usual.

“No... Mom... you... are so beautiful...” His voice was a little stammering.

"Come here." Mother held out her hand toward him.

He walked over and sat down by the bed. His mother took his hand and placed it at her waist.

“Do you like Mom’s lingerie? I bought it specially this morning.”

"Like it. Anything worn on you, I like."

Mother chuckled softly, pouting like a little girl: 'Tell me, do you want Mommy?'

“Yes.”

“Mom what?”

Xiaojun looked into her eyes and finally said those words: 'I want your body.'

Mother's cheeks flushed even redder, but she actively moved her body into his embrace: 'Then what are you waiting for? Aren't you going to unwrap your gift?'

He could no longer hold back and pulled her into his arms, lowering his head to kiss the lips he had longed for day and night. His mother immediately responded, her soft tongue taking the initiative to slip in and tangle with his. His hand kneaded her breast through the translucent bra; the touch was soft and springy, and her nipples were already slightly standing up.

The kiss lasted a long time. When they separated, both were somewhat breathless.

「Xiaojun…… hold me……」 Mother took the initiative to wrap herself around him, kissing his face over and over with tiny pecks.

His hand moved down along her waist and reached into the pair of triangular panties held up only by silk cords, his fingertips touching the pubic hair that was already somewhat damp. His mother gently lifted her waist to make it easier for him.

"Come, smell it." She suddenly knelt up and moved her lower body close to his face.

A faint, sweet fragrance mixed with perfume drifted into her nose.

“Mom specially sprayed perfume for you.”

Xiao Jun stopped being polite. He pushed her down again, lifted her legs, and used his teeth to undo the ties of her panties. The fabric slipped away, fully exposing her vulva. He lowered his head, taking it into his mouth, his tongue carefully licking along her labia, sometimes sucking her clit, sometimes probing shallowly in and out of her vagina.

"Ah... so good... Xiaojun... your tongue... so skilled..." The mother's voice already carried a distinct seductive tone, and her hands unconsciously gripped the bedsheets tightly.

While serving me with his tongue, he took off his own clothes. When the underwear was pulled down, the hard shaft sprung out.

Mother looked at it, her eyes widening slightly: 'So thick... it didn't seem this big yesterday...'

“Do you like it?” He held himself and rubbed the tip back and forth at the entrance of her already wet pussy.

"Like it... Mom likes it... come in quickly... thrust into the place you've fantasized about for so many years..."

Xiaojun took a deep breath, suppressing his urgent desire, and continued to slowly rub with the head of his penis. The juices had already made the glans glisten.

"Good son... stop teasing Mom... hurry and put it in..."

“Mom, make yourself clear. How do you want your son to do it?”

Mother's eyes were already somewhat dazed, her voice so soft it was almost inaudible: 'Fuck... fuck Mommy quickly... Mommy lets her dear son fuck... I'll let you fuck me every day from now on...'

“Say it clearly, who is going to get fucked?”

“Mom... dear mom... is about to be fucked by your own son... hurry...”

Xiaojun sank his hips down with a 'plop,' his entire penis burying itself to the hilt.

“Ah... it hurts... be gentler...” Mother frowned slightly, pushing against his chest with both hands. “It’s been more than ten years since anything went in... it’s very tight inside... don’t move yet...”

He immediately stopped, lowered his head and took one of her breasts into his mouth, lightly teasing the nipple with his tongue. The mother’s body gradually softened, and her breathing became rapid again.

"It's okay already... Jun... it's so itchy down there... move..."

Xiaojun lifted her legs onto his shoulders and began moving slowly in and out. The warm, tight inner walls tightly enveloped him, each thrust bringing intense friction. Her mother's juices increased, producing clear, wet sounds.

"Ah... so deep... Xiaojun... you fuck mom so well..."

“Mom’s insides are so hot... so good at clamping...”

"Because it’s... being penetrated by my own son... that makes it feel so good... ah... harder..."

Xiaojun gradually increased his pace, the sound of flesh slapping echoing in the room. Her mother's moans also grew bolder.

"My own son... a godmother... this feeling... it's too exciting... Mother lived all these years in vain... I knew she was so beautiful long ago... I should have given her to you sooner..."

“Mom... your son likes fucking you... likes watching you get fucked until you’re dripping wet by your son...”

"Ah... if you keep saying... keep saying these things... Mom is going to... soon... together... cum inside... shoot into Mom's inside..."

Mother's body suddenly tensed, her vagina contracting violently. Xiao Jun let out a low roar, releasing all his scalding semen into the deepest part. The two held each other tightly, feeling the afterglow of their climax.

After a long while, Xiao Jun slowly withdrew. The mixed fluids trickled down along the inside of his mother's thigh. He looked down and couldn't help but reach out to gently caress the swollen, reddened opening.

Mother opened her eyes, her voice still a bit hoarse: 'Carry me back to your room.'

Xiaojun picked her up in his arms, carried her to his bedroom, and gently laid her on the bed. Naked, they continued to caress each other.

Mother suddenly spoke: 'Xiao Jun, we need to make a proper agreement.'

"What agreement?"

“The usual way of life can’t change. Outside, I’m still your mother, and you’re still my son. We can’t let anyone see anything unusual. Mom is a supervisor at the company, so being suspected too early wouldn’t be good.”

Xiaojun nodded.

“But…” the mother reached out and held his hardening penis again. “Mom promised you, I’ll give it to you every day. It just can’t be too frequent; we have to take it slow. What we want is long-term, not just a moment.”

"I understand."

Mother took the 'Mother-Son Incest' videotape from his hidden box, glanced at him playfully, and said, 'We won't count today's session yet. Let's go to the living room, watch it together, and... do it again.'

She took his hand and led him to the living room, inserting the videotape into the player. The screen flickered to life, showing familiar scenes of mother-son intercourse on the TV.

Mother leaned into his embrace, actively parted her legs, and guided his hand to explore her private parts once more.

“They’re so absorbed in it... we can’t lose either.”

Xiao Jun hugged her from behind, his hardened member again pressing against her still-moist entrance, slowly but firmly entering once more.

Mother let out a satisfied sigh, her body arching back to meet his.

The moans from the TV gradually overlapped with the panting in reality.

From this day on, their “intimate diary” officially began.

Every morning, Mother would leave a short note in the new diary. Sometimes a reminder for him to come home early at noon, sometimes telling him what position she wants to try at night, sometimes simply writing, 'I want you tonight.'

During the day, they maintained the most ordinary mother-son relationship. The mother went to work as usual, Xiao Jun attended class or stayed home as usual. Only after closing the door and drawing the curtains would those suppressed desires be completely released.

Sometimes it was in the kitchen, right after mother finished washing dishes, he hugged her from behind, skirt lifted, entering in a standing position. Sometimes it was in the bathroom, hot water showering their entwined bodies, mother pressed against the wall, legs wrapped around his waist. More often it was in bed, they would dim the lights, slowly exploring each other's bodies, trying every conceivable position.

Mother gradually became bolder. She would take the initiative to ride on top of him, moving up and down on her own, looking into his eyes while saying: 'My dear son's cock... fills Mommy so full...'

Xiao Jun would also not pull out after she climaxed, continuing to grind slowly, listening to her pleas for mercy and then for more.

The diary was filled day by day.

One day, mother wrote on it: 'Company dinner today, socializing until very late. But I kept thinking about your thing the whole way. After coming home, Mom will shower first, you get ready and wait for me.'

After seeing it, Xiaojun immediately got hard.

That night, after showering, my mother came out wrapped only in a towel. The towel loosened in front of him and fell to the ground. Without saying anything more, she directly straddled him, aligned herself, and slowly sat all the way down.

"I haven't been fucked by you for a day... it feels unbearably empty inside..."

Xiaojun held her waist, thrusting upwards forcefully. Her mother's breasts swayed before his eyes; he lifted his head to take one into his mouth, sucking hard.

"Ah... bite gently... my nipples are so sensitive..."

“Mom’s breasts... from now on, only the son can have them...”

"Mm... only to you... ah... a little deeper..."

They kept at it until well after midnight before stopping. Her mother lay across his chest, her fingers lightly tracing his pectoral muscles, her voice already tinged with sleepiness:

"Xiaojun, will we…… keep going like this forever?"

"I will." He kissed her hair, "As long as you want, I’ll always be here."

Mother was silent for a moment, then said softly: 'Then let it always be like this. During the day, we are mother and son; at night, we are... people who belong only to each other.'

Xiaojun held her tighter.

The night outside the window is deep. Only the two people's calming breaths remain in the room, along with the lingering scent of desire in the air that hasn't fully dissipated.

Once the forbidden pleasure begins, it can never be stopped. And they have prepared to spend a lifetime keeping this secret.

Since that day, the air in the house seemed to have become different.

On the surface, everything remained normal. Mother still got up at seven every morning, washed up, put on makeup, wore her professional suit, changed into high heels at the entrance, reminded Xiao Jun to remember to eat, and then left for work. Xiao Jun would also respond as usual, watching her leave. But only they themselves knew that the sound of those high heels stepping on the floor had become a kind of secret signal—after returning at night, these shoes would be casually kicked off, and the person would change into another appearance.

The diary became the most important bond between them.

Every morning, Mother would leave a few lines in the 'Intimacy Diary.' The handwriting remained neat, but the content grew increasingly explicit.

One day it was written:

"You were fucked until your legs went weak last night, and today even walking feels a little unnatural. If you come back at noon, there’s lunch I left in the kitchen. After you finish eating, wash the bowl. Tonight Mom wants to try from behind."

Another day, it was written:

"Today the company meeting dragged on until very late, but my head is full of the feeling you shot into me yesterday. When you get home, shower first, dim the lights, and wait for me."

Every time Xiaojun saw these words, his lower body would immediately react. After his mother went to work, he would repeatedly browse those pages, imagining her expression when she wrote those things, imagining her in a suit, sitting in the office, yet thinking about her son's cock.

True indulgence usually happens at night.

After entering the house, Mother would first speak to him in a normal tone, asking how his day was and whether he had finished his homework. Then she would go into the bedroom and change out of her professional attire. Sometimes she would come out wearing only that red set of lingerie; sometimes she would be completely naked, draped in a thin robe; more often, she would walk straight to his room, lock the door behind her, say nothing, and just look at him.

Once, Mother came home earlier than usual. Xiao Jun was watching TV in the living room when he heard the sound of a key turning. Looking up, he saw her. Mother was wearing a black bodycon skirt that day, with the top buttoned only to the third button, faintly revealing the edge of her lace bra inside.

She put down her bag, walked up to him, and without saying a word, reached to unzip her skirt. The skirt slipped off, revealing high-slit black stockings paired with a thong. She straddled his lap, wrapped her arms around his neck, and whispered:

"I haven't been touched by you for a day, and it feels unbearably empty inside."

Xiaojun's hand immediately went to her waist, sliding up along the edge of her stockings. Her mother was already wet. He pushed aside the almost non-existent strip of fabric, his finger easily slipping inside, feeling the warm, soft flesh immediately cling to him.

“Mom is already so wet...”

“You’re still thinking about me.” The mother took the initiative to twist her waist, letting his fingers go deeper, “I’d been clenching my legs the whole time in the office, afraid the wetness would soak through my skirt.”

Xiaojun picked her up and pressed her directly onto the sofa. He wasn't in a hurry to enter; instead, he first tore open her top and took one breast into his mouth, sucking hard. Her mother's nipple hardened between his teeth, her body squirming restlessly. His other hand continued its movements below, sometimes digging, sometimes pressing her clitoris.

"Don’t just play with the top... the bottom needs attention too..." Mother’s voice was already carrying a panting breath.

He finally unfastened his pants, releasing the penis that had long been hard and aching, and pressed it against her opening. His mother reached out and took hold of it herself, lined it up, and then sat down onto it.

"Mm... it's in... so full..."

Xiaojun held her waist and began thrusting upwards. The sofa emitted faint creaks. Her mother's breasts swayed before his eyes; he raised his head to bite, leaving shallow teeth marks. Her mother, pushed forward by the thrusts, braced her hands against his chest, matching his rhythm as she moved up and down.

"My own son's dick... is fucking godson mother so deep... ah... a little harder..."

“Mom’s insides clamp so well... have you been thinking all day about being fucked by your son?”

"Want... have wanted all along... even while in meetings I was thinking about it... thinking about being pressed onto the office desk by you and fucked..."

The sound of flesh colliding grew increasingly rapid. Mother's wanton moans also gradually grew louder, no longer restrained by volume. Xiao Jun suddenly flipped her over, making her kneel on the sofa, and drove deep into her from behind again. This position allowed for even deeper penetration, each thrust hitting the innermost depths. Mother's fingers tightly gripped the sofa backrest, her waist sinking down, lifting her buttocks even higher.

“That’s it there… put in some force… fuck Mom all broken…”

Xiaojun gripped her waist, thrusting fast and hard. The juices were churned into white froth, trickling down her thighs. Her mother's body began to tremble, her vagina contracting violently. Knowing she was about to climax, he thrust even more forcefully until she let out a long moan and went completely limp. Only then did he roar, releasing inside her, filling her with gushes of hot semen.

The two kept to the connected position and panted for quite a while. Only then did Xiao Jun slowly withdraw. The mixed fluid immediately gushed from the swollen opening, dripping onto the sofa. Mother looked back at him; her eyes were still hazy from the climax, yet she reached out to smear away the liquid and said in a low voice:

"Don’t waste it... put it back on."

Xiaojun's heart skipped a beat. He did as told, using his fingers to push the semen back inside. Her mother let out a soft moan, her body trembling slightly again.

Such nights almost became routine.

Sometimes they would do it in the kitchen. Mother, wearing an apron preparing dinner, Xiao Jun would hug her from behind, lift her skirt, and enter her in a standing position. Mother had to support herself with one hand on the countertop, the other still needing to continue chopping vegetables, yet her body honestly pushed back.

"Gently... the knife will cut your hand..."

"Then Mom shouldn’t clamp so tightly."

Mother was both embarrassed and excited by his words, her inner walls involuntarily contracting. Xiao Jun simply pressed her hands onto the countertop and began thrusting into her with wide, forceful strokes. The kitchen knife clattered from the vibrations, vegetable leaves scattered everywhere. In the end, Mother only finished making dinner after he had fucked her to climax, her legs weak.

The bathroom was also a frequented place. Hot water showered down on their entangled bodies, steam fogging the mirror. Xiao Jun would press his mother against the tiled wall, lift one of her legs, and enter her from the front. Water mixed with her fluids and semen flowed down, pooling at the floor drain. Her mother's hair clung wetly to her face, but her eyes were startlingly bright.

“To be fucked by my son here... it feels so dirty... and so exciting...”

“Mom likes it dirty.”

"Like it... I only like being dirtied by you..."

The diary grew thicker day by day.

Mother began recording more detailed feelings in the notebook. Sometimes she wrote about what color panties she wore to work that day, intended for him to discover at night; sometimes she wrote about suddenly remembering the feeling of being creampied the night before during a meeting, having to clench her legs to prevent moisture from leaking; sometimes she simply drew a small heart next to the words 'Want it three times tonight.'

Xiao Jun would also reply. His handwriting wasn't as neat as his mother's, but it was equally straightforward:

“When I came back at noon, I smelled the underwear you had changed out of. There was your scent on it, and I stayed hard all afternoon.”

"Yesterday when I fucked you from behind, you clenched me so hard I almost came right away. Tonight I still want it like that."

“Mom’s pussy is mine. From now on, only I’m allowed to stick it in.”

When Mother saw these words, she would always come find him right after work. Once, she didn't even change her clothes, pressing Xiao Jun against the wall in the entryway, pulling down his zipper, and kneeling to take him into her mouth. As she moved her mouth, she looked up at him, her eyes full of laughter.

"Writing that kind of thing... do you want mom to eat you up?"

Xiaojun panted, his fingers threading through her hair: 'I want to come in Mom's mouth.'

Mother increased the suction force, her tongue nimbly wrapping around the glans. Within minutes, he ejaculated. Mother didn't spit it out but swallowed it all, then stuck out her tongue to show him her clean mouth.

“My good son’s thing... Mom has accepted it all.”

As the days passed, they tried more and more positions. The mother would actively ask to have her hands tied, letting him completely control the pace; she would also ride him when he was tired, finding the most comfortable angle to grind. Once, they even did it in the shadows on the balcony. The night breeze brushed against their naked skin, with the city lights in the distance. The mother bit her own hand to keep sounds from escaping, but her body tightened even more due to tension.

"What if someone sees us..."

"Then let them see clearly that it’s the son doing his own biological mother."

Stimulated by those words, the mother climaxed directly, her body convulsing violently, squeezing Xiao Jun until he also ejaculated.

On nights after climax, they usually lay naked, holding each other and chatting. Topics ranged from today's diary to things from long ago. The mother would mention fragments of his childhood, her voice gentle; Xiaojun would listen, but his hands would wander restlessly over her body until both sides reacted again, and then naturally began the next round.

One day, mother wrote a long passage in her diary:

"Xiaojun, sometimes I feel like I’ve gone crazy. I clearly know this isn’t allowed, but every time you enter me, I feel like my whole body becomes complete. By day I’m a successful career woman in others’ eyes, and at night I only want to be your woman. This split scares me, yet it also makes me addicted. I don’t know what the future will be like, but I know that as long as you still want me, Mom will always be here, using this body to catch all of your desires."

After seeing it, Xiaojun made her cry that very night. While thrusting forcefully, he whispered repeatedly in her ear: 'I love you. Not ordinary love. The kind of love that wants to fuck you until you can never leave me.'

Mother was fucked into incoherence by him, only able to nod, only able to tighten her body, only able to cry out his name, cry out 'son,' cry out 'dear husband' when she climaxed.

Time quietly flowed away in this secretive descent.

The outside world continued to operate as usual. Mother's company performance was getting better and better, and Xiao Jun's studies hadn't fallen behind. No one noticed anything unusual. They appeared among relatives' gatherings, school events, and supermarket shoppers like the most ordinary mother and son. But only they themselves knew what kind of scorching and forbidden nights were hidden behind the door they closed when they returned home.

Diary notebooks have been replaced one after another.

Every page records the entanglement of bodies, the stimulation of words, and those unspoken yet necessary expressions of love.

Once, after finishing the whole night, Mother lay on his chest, her voice already hoarse:

"If we keep going like this... how are you going to find other girls in the future?"

Xiaojun stroked her sweat-dampened back, answering slowly but clearly:

"I'm not looking. I only want you. From the day I realized I wanted you, I only wanted you."

Mother was silent for a long time, then raised her head and placed a gentle yet lingering kiss on his lips.

"Then let’s leave it at that," she said. "By day, mother and son; by night, each other’s person. Until we’re all old and can’t walk anymore, we’ll still have to hold each other."

Xiaojun hugged her tighter.

The night outside the window is profound. Only the two people's intertwined breaths remain in the room, along with the thick, almost tangible scent of desire in the air.

Once the dam of the forbidden river breaks, it will never turn back.

And they had willingly sunk to the deepest depths, using their bodies, their diaries, and a lifetime of secrets to turn this forbidden love into each other's only faith.

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