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◷ 2026-09-20◉ 0
Family incest

After the adult son's incest diary was discovered by his mother, years of repressed desires completely erupted. The mother actively put on sexy lingerie, offering her body as a birthday gift. Under a secret agreement, they maintained their mother-son identity during the day, while at night, they sank into forbidden physical entanglement, each union filled with stimulation and inseparable familial affection.

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When Xiao Jun 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 he was 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 to take his penis in and out, one stroke after another. The squelching sounds, her slight throat sounds when swallowing semen, and the few lines she left in the diary before leaving were all still swirling in my mind.

He sat up abruptly and saw the diary spread open on the desk. On the new page, in his mother’s graceful handwriting, it said:

"Yesterday's video was really good-looking, but that mother and son at the end were just too stupid. No one knew about it anyway, so why commit suicide? Talking about ethics and morality is all just lying to comfort yourself. 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 is going to give you a birthday present."

Xiao Jun 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 why was he hesitating?

He quickly washed up and ate something simple, but he simply couldn’t calm down. The clock ticked on, one notch at a time, and he almost stared at the hands, waiting until noon. The moment the time came, he rushed home as if flying.

Pushing open the door, my mother's familiar high heels were placed in 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 by just two thin strings. She wore light makeup, her hair slightly curled, and her eyes were seductive enough to drip water.

Xiao Jun stood frozen in the doorway.

"Xiaojun, you don’t recognize Mom anymore?" Mother’s voice carried a smile, but 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 on her own waist.

"Do you like this lingerie Mom's wearing? I specially bought it this morning."

"Like it. I like anything worn on you."

The mother chuckled softly, pouting like a little girl: "Say it, do you want Mommy?"

"Yes."

"About what, Mom?"

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

Mother's cheeks flushed even redder, but she actively pressed 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 went on for a long time. When they parted, both of them were a little out of breath.

"Xiaojun... hold me..." Mother took the initiative to hold him tightly, kissing his face tenderly and repeatedly.

His hand moved down from her waist and reached into the pair of triangle panties that were held on only by silk cords, his fingertips touching the pubic hair that was already somewhat damp. Mother gently lifted her waist to make it easier for him to move.

“Come, smell it.” She suddenly knelt up and brought her lower body close to his face.

A faint, perfume-mixed fragrance drifted into my nostrils.

"Mom sprayed perfume especially 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 slid down, fully exposing her vulva. He lowered his head and took it into his mouth, his tongue carefully licking along her labia, sometimes sucking her clitoris, sometimes probing shallowly in and out of her vagina.

"Ah... so good... Xiao Jun... your tongue... you're so skilled..." Mother's voice already carried a clear hint of seductiveness, her hands unconsciously gripping the bedsheet tightly.

While serving with his tongue, he took off his own clothes. When his underwear was pulled down, the rigid manhood sprang out.

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

"Like it?" He grasped himself and rubbed his glans back and forth at her already wet entrance.

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

Xiao Jun took a deep breath, suppressing his urgent desire, and continued slowly rubbing with the glans. The fluids had already made the glans glisten.

"Good son... stop teasing Mom... hurry up and insert it..."

"Mom, make it clear yourself. What do you want your son to do?"

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

"Say it clearly, who is going to be fucked?"

"Mom... dear mom... to be fucked by your own son... hurry..."

Xiao Jun sank his hips, and with a 'plop,' his entire penis was fully buried inside.

“Ah... pain... be gentler...” Mother frowned slightly, both hands pushing against his chest. “It’s been more than ten years since I was entered... it’s very tight inside... don’t move yet...”

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

“It’s okay now... Jun... it’s so itchy down there... move...”“

Xiao Jun lifted her legs onto his shoulders and began thrusting slowly. The warm, tight inner walls tightly enveloped him, each thrust bringing intense friction. Her mother's fluids increased, producing clear wet sounds.

"Ah... so deep... Xiaojun... you feel mom so good..."

"It's so hot inside Mom... so gripping..."

“Because it is... being penetrated by my own biological son... that makes it feel so good... ah... a little deeper...”

Xiao Jun gradually sped up, the sound of flesh slapping echoing in the room. His mother's moans also grew bolder.

「My dear son…… servicing his mom…… this feeling…… is too刺激了…… Mom has wasted so many years alive…… if I’d known it could be this beautiful…… I should have given myself to you long ago……」

"Mom... your son likes fucking you... likes watching you get fucked by your son until you’re dripping with desire..."

“Ah... say it more... say these things more... Mom is going to... soon... together... shoot it in... shoot it 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 the mother's inner thighs. 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.'

Xiao Jun picked her up horizontally, walked to his bedroom, and gently laid her on the bed. Both were now naked, continuing to caress each other.

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

「What agreement?」

“The normal pattern of life can’t change. Outside, I am still your mother, and you are still my son. We can’t let anyone notice anything unusual. Mom is a supervisor at the company; it would be bad if people suspected us too early.”

Xiao Jun nodded.

"But..." Mother reached out and held his hardening penis again. "Mom promises you, I'll give it to you every day. It's just that we can't do it too often; we have to let it flow slowly and steadily. What we want is something long-lasting, not just a moment."

"I understand."

Mother took the "Mother-Son Incest" videotape from his secret box, giving him a playful look: "We won't count today's. Let's go to the living room, watch it, and... do it again."

She took his hand and led him to the living room, inserting the videotape into the machine. The screen began to play, and the familiar scene of mother and son coupling appeared on the television.

The mother leaned into his embrace, actively parted her legs, and guided his hand to explore her private area once more.

"Seeing them doing it so intently... we can't lose either."

Xiao Jun hugged her from behind, his erect penis again pressing against the still-wet entrance, slowly but firmly entering once more.

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

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 it's a reminder for him to come back early at noon, sometimes it's telling him what position she wants to try at night, sometimes it's 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 in the kitchen, mother just finished washing dishes, he hugs her from behind, skirt lifted, entering in a standing position. Sometimes in the bathroom, hot water showers their entwined bodies, mother pressed against the wall, legs wrapped around his waist. More often in bed, they 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, while looking into his eyes and saying: 'My dear son's cock... fills dear Mommy so full...'

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

The diary is filled day by day.

One day, mother wrote above: '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, Xiao Jun 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 screwed by you for a day... it feels unbearably empty inside...”

Xiao Jun held her waist, thrusting upwards forcefully. His mother's breasts swayed before his eyes; he lifted his head and took one into his mouth, sucking hard.

“Ah... bite more gently... my nipples are so sensitive...”

"Mom's breasts... from now on, only her son will get to eat them..."

"Mm…… only for you…… ah…… a little deeper……"

They kept going until the middle of the night before stopping. The mother lay on his chest, her fingers lightly tracing his pectoral muscles, her voice already heavy with sleepiness:

"Xiaojun, will we... continue like this forever?"

"Yes." 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.'

Xiao Jun held her tighter.

Outside the window, the night was deep. In the room, only the two of them catching their breath remained, along with the lingering scent of desire in the air.

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

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

On the surface, everything was normal. Mother still got up at seven every morning, washed up, applied makeup, put on 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 before, watching her leave. But only they themselves knew that the sound of those high heels clicking on the floor had become a kind of secret signal—after returning in the evening, these shoes would be kicked off casually, and the person would transform into another appearance.

The diary became the most important bond between them.

Every morning, mother would leave a few lines in the 'Intimate Diary.' The handwriting is still neat, but the content is becoming more and more explicit.

One day it was written:

“Last night you fucked me so much my legs went weak; today even walking feels a bit unnatural. If you come back at noon, there’s lunch I left in the kitchen. After you eat, wash the bowl, and tonight Mom wants to try from behind.”

Another day it was written:

"Today the company meeting went on very late, but all I can think about is the feeling you shot into me yesterday. When I get home, I'll take a shower first; you dim the lights and wait for me."

Every time Xiao Jun 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 words, imagining her in a suit, sitting in the office, yet thinking about her son's cock.

Real indulgence usually happens at night.

After entering the house, the mother would first speak to him in a normal tone, asking how his day was and if 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 set of red lingerie; sometimes she would be naked, draped only in a thin robe; more often, she would walk directly 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 keys turning. Looking up, he saw her. Today, mother was wearing a black bodycon skirt, with the top buttoned only to the third button, faintly revealing the edge of her lace bra inside.

She put down her bag, walked over to him, and without a word, reached to unzip her own dress. The dress slipped off, revealing a high-slit black garter belt 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.”

Xiao Jun's hand immediately went to her waist, sliding up along the edge of her garter belt. His mother was already wet. He pushed aside the almost non-existent strip of fabric, his finger easily probing inside, feeling the warm, soft flesh immediately gripping him.

"Mom is wet like this herself..."

“Aren’t I just thinking about you.” Mother took the initiative to twist her waist, letting his fingers go deeper, “I’ve been clamping my legs together in the office the whole time, afraid the moisture would soak through my skirt.”

Xiao Jun 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 writhing restlessly. His other hand continued its movements below, sometimes digging, sometimes pressing against her clitoris.

“Don’t just play with the top... the bottom needs it too...” the mother’s voice was already breathy.

He finally unfastened his pants, releasing the penis that had long since been hard and painful, and pressed it against her entrance. His mother reached out herself to hold it, aligned it, and then sat down.

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

Xiao Jun supported her waist and began thrusting upward. The sofa emitted faint creaking sounds. Her mother's breasts swayed before his eyes; he raised his head to bite, leaving shallow tooth marks. His mother, pushed forward by the thrusts, braced her hands against his chest, matching his rhythm as she moved up and down.

「My dear son’s cock…… is thrusting so deeply into dear mom…… ah…… a little harder……」

"Mom, you’re so good at clenching down there... have you been thinking all day about being fucked by your son?"

“Want… I’ve always wanted it… even during meetings I’m thinking about it… thinking about being pressed down on the office desk and fucked by you…”

The sound of flesh colliding grew more frequent. Mother's wanton moans also gradually loosened, no longer caring about 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, raising her buttocks even higher.

“Right there... fuck hard... fuck Mom to pieces...”

Xiao Jun gripped her waist, thrusting fast and hard. The fluids 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 limp. Only then did he roar, ejaculating inside her, filling her with gushes of hot semen.

The two kept breathing for quite a while in their joined position. Xiao Jun finally slowly withdrew. The mixed liquid immediately gushed out of the swollen, reddened opening, dripping onto the sofa. His mother looked back at him, her eyes still hazy after orgasm, yet she reached out and smeared the liquid away, whispering:

“Don’t waste it... smear it back on.”

Xiao Jun's heart skipped a beat. He complied, using his fingers to push the semen back inside. His 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 would honestly push back against him.

“Gently... the knife will cut my hand...”

“Then Mom shouldn’t squeeze 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 on their entangled bodies, steam blurring the mirror. Xiao Jun would press his mother against the tiled wall, lift one of her legs, and enter from the front. Water mixed with vaginal fluids and semen flowed down, accumulating at the drain on the floor. Mother's hair was wet and stuck to her face, but her eyes were strikingly bright.

“Being fucked by my son here... it feels so filthy... and yet so exciting...”

"Mom likes it dirty."

"Like... just like being dirtied by you..."

The diary grows thicker day by day.

Mother began recording more detailed feelings in it. Sometimes she'd write about what color panties she wore to work that day, meant for him to discover at night; sometimes she'd write about suddenly remembering the feeling of being creampied the night before during a meeting, having to clench her legs to keep the wetness from seeping out; sometimes she'd simply draw a little heart, with "Want it three times tonight" written beside it.

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

"At noon when I came back, I smelled the underwear you had changed out of. It had your scent on it, and I was hard for the whole afternoon."

"When I fucked you from behind yesterday, you clenched me so hard I almost came immediately. I still want it like that tonight."

"Mom's pussy is mine. From now on, only I am allowed to fuck it."

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

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

Xiao Jun panted, his fingers threading through her hair: 'Want to cum in Mom's mouth.'

Mother increased the suction, her tongue skillfully wrapping around the glans. Within minutes, he came. Mother didn't spit it out; instead, she swallowed it all, then stuck out her tongue to show him her clean mouth.

「My good son’s things…… Mom will take them 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 rhythm; she would also ride on top 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 from making a sound, but her body tightened even more due to the tension.

“What if we're seen...”

“Then let them see clearly that it’s a son doing his own birth 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. Mother would mention fragments of his childhood, her voice gentle; Xiaojun would listen, but his hands would wander restlessly over her body until both were aroused 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 as if my whole self becomes complete. By day I’m the successful strong woman in others’ eyes; by night I only want to be your woman. This split personality frightens 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 your desires."

After seeing it, Xiao Jun 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' during her climax.

Time quietly slipped away in this secretive descent.

The outside world continued to operate as usual. The mother's company was doing better and better, and Xiaojun's studies had not fallen behind either. No one noticed anything unusual. They appeared in the crowd at family gatherings, school activities, and supermarket shopping like the most ordinary mother and son. But only they knew what kind of scorching, forbidden nights were hidden behind the door they closed when they got home.

Diaries were replaced one after another.

Every page records the entanglement of bodies, the stimulation of words, and those feelings of love that are unspeakable yet must be written down.

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

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

Xiao Jun 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 do that.” She said, “By day we’ll be mother and son; by night, we’ll belong to each other. Until we’re both old and can’t walk anymore, we still have to hold each other in our arms.”

Xiao Jun held her closer.

Outside the window, the night was profound. In the room, only the intertwined breathing of the two remained, along with the thick, palpable scent of desire in the air.

Once the river of taboo bursts its banks, it will never turn back.

And they have willingly sunk to the deepest depths, using their bodies, diaries, and lifelong secrets to turn this illicit love into their only faith in each other.

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