ONYX FICTIONThe last night of the busty mother-in-law: the secret entanglement of son-in-law and mother-in-law
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The last night of the busty mother-in-law: the secret entanglement of son-in-law and mother-in-law

♙ Anonymous◷ 2026-09-18◉ 0
Real experience

On the last day of the married man's stay at his mother-in-law's house, he finally got the chance to be alone with her. At night, with his father-in-law and wife both absent, he and his voluptuous mother-in-law in her forties tentatively explored, embraced, and entered each other on the rural heated kang bed.

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Still staying at my mother-in-law's house, it's been about five or six days since I did it with her. During these days, although my mother-in-law occasionally speaks to me, you can still tell she feels awkward. That's for sure. I don't know what to do in the future either; I can only take it one step at a time. During this period, my father-in-law and wife have been home the whole time, so there hasn't been any chance to be alone with my mother-in-law.

Either my father-in-law went out and my wife was at home, or my wife went out and my father-in-law was at home, or my mother-in-law and my wife went out together. In short, my mother-in-law never gave me a chance to be alone with her at home.

Even when alone together, it was only for a few minutes, couldn't do anything. There was one time at night, my father-in-law went out to play mahjong. My wife said she needed to use the toilet. I stole a glance at my mother-in-law and found her looking at me too. Then my wife said she was afraid of the dark and wanted me to accompany her outside. My mother-in-law noticed the expression on my face and secretly smiled.

Just when I thought there was no more possibility, on the last day at my mother-in-law's house, I finally got my wish. That day, my wife's eldest aunt, knowing we were leaving the next day, came over in the evening to invite our whole family for dinner.

After dinner, my wife said she wanted to stay overnight with her cousin, saying that once things got busy, she didn't know when they'd see each other again. I happily agreed. My father-in-law still wanted to drink a bit more with my uncle-in-law, so I made an excuse, saying I'd had a bit too much to drink and wanted to go back and rest.

Originally, my wife's aunt wanted me to rest at her house, but that would ruin my plans. So I insisted on going back, saying there was no place to sleep here and it was inconvenient, etc. I was actually thinking about how to trick my mother-in-law into letting me return, but I didn't expect her to proactively offer to go back with me, saying she was worried about my safety on the road since I was drunk.

My mother-in-law actively supported me as we said goodbye to them at the door. As soon as we turned the corner, she let go of me and strode ahead. I immediately caught up, reached out, and tried to hug her waist.

"Mom, why are you walking so fast? I’m still dizzy; help me walk."

My mother-in-law felt me getting closer and looked around vigilantly. Seeing that it was too dark to see anything, she hit the back of my hand but didn't pull it away. Instead, she leaned slightly closer. 'Are you drunk? Do you still need someone to support you? You're just pretending.'

Seeing the smile on my mother-in-law's face, I knew tonight was promising. Without further ado, I tightened my arms around her and quickly led her home, with her pace quickening to match mine.

“Hehe, slow down, be careful where you step in the dark—you’re still this fast even when you’re drunk.”

"Mom, let's hurry. I don't know how long they're drinking over there, but if we hurry for a minute now, we'll get one more minute of pleasure later."

“Once they start drinking, they can go on for ages. It doesn’t count unless it’s at least two hours. Comfortable? What did I promise you?”

At first, my mother-in-law clearly told me to relax, but later she still felt embarrassed and pretended not to know anything. I didn't expose her either. Embracing her, I buried my head and hurried along, my hands starting to get restless and reaching for her buttocks. She felt my intrusion and, without saying a word, pressed her body closer to mine.

All the way we hugged and walked to the front door. My mother-in-law went up to take out the key and open the door. I贴了上去抱住了岳母的腰, and my hands started misbehaving, groping in my mother-in-law’s crotch. My mother-in-law’s hand trembled, and the key slipped in the lock and didn’t go in.

"Mom, you’ve had this hole penetrated for so many years, why can’t I get it in anymore? What’s going on?"

My mother-in-law pushed back against me but didn't stop what she was doing. After opening the door, I followed her into the yard. 'What's going on? Don't you know? It's all your fault. You dare to do it right at the doorway, aren't you afraid of passersby seeing?'

“What would I dare do? Mom, what would I dare do?”

"I think the bigger you get, the less decent you become. Tell me, what is there that you still wouldn't dare do?"

My mother-in-law turned around to close the door and locked it from the inside with a lock. This way, when my father-in-law returns, he won't be able to open it. Although it's safe, won't he think we're doing something inside?

My mother-in-law saw my confusion and casually said, 'It's fine, it's like this here. We lock the doors early at night, worried about thieves. When he comes back, he'll knock. It's always been like this before.'

“ ‘Before’...? Could it be that my mother-in-law used to be with someone else? I didn’t dare imagine it.”

My mother-in-law also noticed me looking at her with a strange gaze and immediately understood what I was thinking. She chuckled, raised her hand, and hit me. With a resentful look, she said, 'What are you thinking? What kind of person do you take me for?'

As soon as he finished saying this, he thought of what had happened with me again, “You’re the meanest. Before, when no one was here, I would lock the door early too, afraid someone would come in and steal things. That’s how it is in the countryside.”

So that’s how it is. Looking at mother-in-law’s alluring eyes, my heart raced and I could no longer wait. I pulled mother-in-law along as we walked home.

Entering the room, he casually closed the door and asked his mother-in-law, 'Mom, which room should we go to?'

My mother-in-law looked around and walked toward her own room. I followed her into the west room. She sat on the edge of the kang and began taking off her top, and I sat down beside her.

I reached out and wrapped my arm around my mother-in-law. My right hand slid onto my mother-in-law’s chest, and my left hand went into my mother-in-law’s crotch. Since my mother-in-law was wearing those tight black pants today, my right hand felt a round, bulging lump.

My mother-in-law reached out to pull my hand away, but I pressed down tightly, and she couldn't free it. My hand began rubbing against her crotch over her pants, and she pressed down on my mischievous hand.

"Hehe, it itches. Don’t move around, you’re drunk and still so annoying. Go to sleep."

"Mom, sleeping alone is so boring. Let me sleep with you; I’ll warm your bed for you."

My mother-in-law gave me a glare, didn't continue to pull my hand, and leaned her body toward me instead. Although my right hand couldn't move, my left hand began to knead her chest.

"Hurry up, Mom, let's make the most of the time. My dad will be back soon, and then we won't be able to do anything at all." With my right hand, through her sweater, I felt my mother-in-law's full breasts, and with my left hand I felt her full vagina. It was really great; we need to hurry.

“Don’t you still have your dad in your eyes? Can you do that? Wouldn’t that let him down?”

"Why can't we do it? Didn't you do it last night too?"

"What else could it be? It's been almost half a year since I've done it with your dad."

I could clearly see the resentment in my mother-in-law's eyes. It seemed my father-in-law hadn't watered her field for a long time; she was very thirsty. This gave me even more of a chance. Sensing the impropriety of her words, my mother-in-law quickly corrected herself, 'How can that be the same? Who are you, and who am I? Are you and I suitable?'

"I am your son-in-law, you are my mother-in-law, and a son-in-law is half a son to his mother-in-law. Come on, let your son properly take care of you."

As I spoke, I pushed my mother-in-law onto the kang, flipped over, and pressed down on her body, facing her directly. 'Get off, I don't have a son like you. If you were my son, I'd have hit you long ago.'

Although she said this, her eyes were full of shyness. I kissed her lips, my tongue entering her mouth and stirring hers. Although we had kissed before, that time was rushed and just a simple touch of lips. This was the first time our tongues made contact like this.

Kissing the mother-in-law in the mouth, his hand groped below the mother-in-law and started undoing her belt. The mother-in-law felt the movement of my lower body and pushed my head away. The saliva on my mouth was still sticking to her, looking ridiculous; the mother-in-law stuck out her tongue and licked the saliva at the corner of her mouth.

"Mm mm... don't do it here, go to your place. What if he comes back and notices after you finish here in my place?"

I stood up and tried to pull my mother-in-law away, but couldn't move her. She also pulled me back slightly. I turned around and looked at her with confusion.

"Look at how impatient you are. Can that be done with clothes on? Take them off."

"Take it off over there, hurry up." As I said this, I pulled Mother-in-law up to leave, but she pushed me away.

My mother-in-law pushed me out while walking and said, 'But you have to let me spread out the quilt first. What if there's no time later?'

"Mom, hurry up, I’m waiting for you."

"Get lost."

I began walking out,耳边传来了岳母的呵斥声. Although it was a scolding tone, I could still detect娇羞和激动的情绪 within it.

I quickly returned to the west room, laid out my luggage, took off all my clothes, and lay on the kang waiting for my mother-in-law to arrive. Before long, I heard footsteps approaching. I looked up and saw my mother-in-law holding an old bedsheet, still wearing the thermal long johns from the morning on her lower body, with only a white tight-fitting tank top on top.

"Mom, what is this for?"

"What? You and Juanzi don't use this? Then you two really waste bedsheets." As she spoke, Mother-in-law threw it over. It turned out to be the sheet laid under us when doing it; my wife and I usually just spread a bath towel. Looking at this sheet, it had definitely been there a long time—it must have been the one Father-in-law and Mother-in-law used when they did it.

Hehe, my father-in-law's bed sheets are now being used by me, haha. I picked up the bedsheet and spread it under me.

Seeing my mother-in-law approach, I sat up. As soon as she got on the kang, I pulled her onto my lap. Holding her face-to-face like this, I could feel the warmth of her breath.

「You’re not even wearing anything, aren’t you afraid of catching a cold?」 Mother-in-law wrapped her arms around my neck, and her breath brushed against my face, making it itch. The dick down below quickly swelled up, pressing against Mother-in-law’s ass.

“Hehe, Mom, I’m fine. My body’s great—look how strong I am. Besides, I still have to take it off in a bit; that’d be such a hassle.”

Seeing the desire revealed in my mother-in-law's eyes, I held her body and began to move back and forth. My cock rubbed against her lower body through her autumn pants. Even though it was through the pants, holding my mother-in-law's voluptuous body was already very stimulating.

"Hey... slow down. If it's such a hassle, don't do it. Did I tell you to do it?"

To keep balance, my mother-in-law held me tighter, resting her head on my shoulder, her breasts pressed against my chest. My mother-in-law also felt the rubbing of my dick; although she said that with her mouth, her lower body started to press downward on its own, and as I swayed she gently moved left and right with me.

"No trouble, no trouble, not troublesome at all. I'd rather hold you like this for a lifetime and never let go."

My hand fumbled to find my mother-in-law's vest, wanting to take it off. She cooperatively raised her arms. After I removed the vest, she got off my lap and started taking off her thermal pants, saying as she did:

“Get into the blanket; it’s too cold outside. Be careful not to catch a cold.”

Rural life really is not like the city; the key thing is there’s no air conditioning. My mother-in-law and I had only been holding each other for a moment before we already felt cold. I lay down under the quilt and spread one side a bit, waiting for my mother-in-law to get in.

My mother-in-law pulled her panties down from her ankles, threw them aside, and slipped under the covers. Now we were face to face. Holding her smooth body, although she was over 40, her skin was still tender and smooth. Compared to my wife, she just had more body fat.

One hand kneaded my mother-in-law's breasts; they were a bit soft, but still very big, with dark nipples. The other hand groped downward along my mother-in-law's belly and pressed against her vulva, where the middle finger parted the two labia and felt the sticky flesh inside.

It seemed my mother-in-law was already aroused; inside was very wet. Feeling my hand's invasive touch, she instinctively shrank back, then actively leaned forward again. She placed her hand on my buttocks, pressing me closer to her.

"Hurry up, it's getting late. Your dad will be back in a bit, and then let's see what you do."

The dick pressed against my mother-in-law's thigh. Knowing time was truly tight today, I stopped the chatter, flipped over and pressed onto my mother-in-law's body, the dick pressing against her labia. "Mmm... hmph... Usually I don't feel how heavy you are."

My mother-in-law spread her thighs apart, grabbed my cock, parted her labia, rubbed it a few times at the entrance of her vagina, and pushed it in. Nodding at me, she said, 'Come in.'

I slowly pushed in. Mother-in-law's inside was very slippery, completely without the friction from that morning. After pulling my glans in and out a few times, I felt my cock was very wet. I inserted my cock all the way in, hugged Mother-in-law and kissed her, then stopped moving my cock, watching her expression as it was inserted.

The instant I thrust in hard, my mother-in-law opened her mouth, drew in a deep breath, tilted her head back slightly, and her lower body proactively thrust upward, sucking my cock, which had only gone in halfway, deep inside. Seeing that I had stopped moving, my mother-in-law pushed her hips upward on her own and looked at me with a puzzled gaze. “What’s wrong? Did it come out? Why is it so fast today?”

So mother-in-law thought I had ejaculated. Joking, how could that be. My dick started thrusting downward, each time with great force. “How could I? Mom, if I haven’t satisfied you, how dare I cum? Today I’m going to make you come first.”

My mother-in-law felt my thrusts, relaxed, and began to respond to me. She placed her hands on my buttocks, her legs wrapping around my waist, and her lower body began to move up and down.

I also began thrusting forcefully, the joining area making slapping sounds, each time pulling out halfway before rapidly plunging back in fully. The room filled with the alternating gasps of me and my mother-in-law.

"Mom, thank you."

"Thanks for what? Hmm..."

"Thank you for letting me fuck your pussy."

"That sounds so awful. So I was right after all, you little bad boy. Slow down..."

“Of course I did it right, otherwise how could the two of us be this comfortable? Was it fucking hurting you?”

“No, I’m not a little girl, why would it hurt? Ow... this fast and I’m already sweating, I’m afraid I’ll catch a cold.”

"Mom, I don't think you're afraid of sweating; you're afraid I'll ejaculate, right? Don't worry, I'm still far from it."

“Oh... do whatever you want. Anyway, mm... okay...”

"So what if I do, Mom? So what if I already fucked you? Yeah, I've already fucked you, so what's there to be afraid of."

Suddenly feeling like I was about to cum, I decided to change positions. I pulled my dick out. My mother-in-law was right in the middle of her excitement and didn't expect me to pull out. Her body arched upward, her hands tightly holding my waist.

"Mom, are you tired? If not, let’s change positions; I want to do it from behind."

“You’re always making a fuss.”

Upon hearing what I said, my mother-in-law raised her hand and hit my back, but she didn't object. Seeing me get up, she also sat up herself, secretly glanced at my cock, found it still hard and standing, then crawled over, her buttocks raised.

The place where my mother-in-law and I were joined was already soaked. Her buttocks were raised towards me, her dark pubic hair covered with slippery fluid, pressed askew by me. Her labia parted, the opening gaping, waiting for the comfort of my cock.

I lay on her back, slowly inserted my cock, then wrapped both hands around to her front, fondling her breasts, and began thrusting violently.

"Mom finally got to fuck you once, so you have to let me feel good too, Mom, move a little."

My mother-in-law's buttocks thrust back, colliding with my rhythm. Although I couldn't insert fully, she tightened her pussy tightly, and the friction on the glans felt very real. I reached out and slapped her buttocks, and her plump, large buttocks immediately rippled with a flesh-colored wave.

“Why are you hitting me, huh? Mm... gently, still not bullied enough, huh.”

"Mom, your butt is really big. I’m serving you, not hurting you. Are you uncomfortable?"

"Feels good, mm... go faster, I think I can't take it anymore."

"Since it feels good, then fuck me a little longer, mom, I still haven’t cum yet."

“Go ahead and shoot; it’s getting late.”

"Hurry over here. It's late today. He'll be back in a bit."

"Oh, Mom, I feel really comfortable today. I’m leaving tomorrow, and I really don’t know if I’ll have another chance in the future."

The speed was getting faster and faster. My mother-in-law was almost pressed flat on the kang by me. I could only fuck her while lying on top of her, which squeezed my cock even tighter. Although the entry angle wasn't good, the feeling of ejaculation came faster this way. My mother-in-law lay on the kang, her voice muffled.

"I'm coming, hurry... ah, harder. Not today. Later... later..."

I'm about to cum too, I urgently asked, 'What about later? Can I still fuck you later? Mom, I'm cumming. I'll cum inside your pussy, okay?'

"Mm... then cum, it's fine if you cum inside. It's okay... okay..."

After finishing, I collapsed onto Mother-in-law's back, lightly pressing down on her. My cock slowly softened inside Mother-in-law's pussy, still able to feel the muscles of her vagina contracting, squeezing out my semen.

Helping his mother-in-law turn over, watching her close her eyes and gasp for breath, he picked up a handkerchief and wiped her lower body. 'Mom, I'm going to fuck you again in the future. You promised me, so no backing out.'

My mother-in-law took the handkerchief from my hand, wiped her lower body, crawled past me, and hooked her panties to put them on. 'What did I promise you? I didn't say anything.'

I got anxious, grabbed my mother-in-law, and kissed her on the mouth.

"Mom, why are you going back on your word? You just agreed and now you’ve changed your mind. I’m coming home tomorrow, and if you keep making me this angry, I won’t be able to concentrate while driving on the way..."

My mother-in-law hit me on the forehead and glared at me. 'What are you saying? It's the New Year. Will you have time later? You only come back a few times a year. When would you have the time?'

Seeing my mother-in-law relent, I kissed her and helped her get her thermal pants and undershirt.

“So that means, in the future, when we have time, we can still do it. Hehe, Mom, you’re really nice.”

My mother-in-law didn't speak, tacitly agreeing. After getting dressed, she started to get out of bed. I slapped her buttocks. 'Smack!'

"Mom, don’t worry, I’ll definitely come back to see you more in the future."

My mother-in-law glanced back at me and walked toward the west room, saying as she went, 'It's your own home, come back whenever you want. Who's stopping you? Hurry back to sleep. You've sweated so much, be careful not to catch a cold. If you need to pee, use the chamber pot; don't go out into the yard.'

It seems my mother-in-law also had needs; otherwise, she wouldn't have come back with me today. In a daze, I heard the front door open, indicating my father-in-law had returned. I heard my mother-in-law get up to answer the door. Soon after, her scolding voice came through, 'At someone else's house, you still don't know to drink less? Do you think this is your own home?'

The next day, while I was sleeping soundly, I was awakened by an itchy feeling on my nose. Opening my eyes, I found my wife sitting on the edge of the kang, using her hair to tickle my nose. I brushed my wife's hair aside and saw that she was already ready to leave.

"Sleeping that soundly? Didn't you say you were less used to other people's homes than your own? I think you seem pretty used to sleeping here."

“Isn’t this our mom’s house? How is it someone else’s house?”

My wife gave me a glare, and I noticed her charming eyes were on par with my mother-in-law's. My cock below involuntarily hardened. I couldn't let my mind wander; I had to get up quickly.

I got up, put on my clothes, and prepared to go home. My parents-in-law saw us off at the door. My father-in-law reminded us to be careful on the road, while my mother-in-law still complained that my wife didn't stay long enough. Haha, I wonder if she was really complaining about us not staying long or complaining about not having enough sex with me.

I said, 'Don't worry, Mom and Dad. I just got married before and didn't know how nice it is to live at our home. From now on, whenever I have time, I'll come back to see you.' When I said this, I specifically looked at my mother-in-law and noticed she was also looking at me. Our eyes met, and she gave me a half-smiling, half-glancing look.

Set off home with my wife. I don’t know when I’ll be able to reunite with my mother-in-law and experience again her plump body and big butt.

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