Hot weather, a weekend afternoon. The spacious living room had no air conditioning on. Two beautiful women sat carefully by the crib, gently waving paper fans in their hands. The child in the crib slept peacefully.
To outsiders, these two beautiful women who look like sisters are actually mother and daughter. One is my wife Li Li, and the other is her mother, my mother-in-law Zhang Shuhua.
My wife is one year younger than me, twenty-seven years old. She has been a good girl since her school days and is now a financial supervisor at a company, meticulous and thorough in everything she does. Her family is well-off, and they wanted her to stay home with the baby, but she insisted otherwise, saying women should have their own careers. As soon as the baby was just over six months old, she went back to work.
My mother-in-law is forty-eight this year and married quite young. After being married off to my father-in-law, who is nearly ten years older, she has always been a full-time housewife. My father-in-law has his own company, business is good, so my mother-in-law doesn't have to struggle for a living. She usually plays cards, goes shopping, gets beauty treatments, living a leisurely life. Because she takes good care of herself, her skin at forty-eight remains firm, white, and tender, with a slim, sexy figure. Uninformed people often secretly ask if she is my wife's older sister. When the family chats about this, my mother-in-law always laughs heartily.
Because the child needed someone to take care of them, and hiring a nanny made the family uneasy. The mother-in-law offered to come help. My wife and I were overjoyed. After making the arrangements, I drove to pick her up. The father-in-law insisted on not living together, saying he had business to discuss recently. I had no choice but to bring only the mother-in-law back.
And so, without any warning, a hidden change quietly unfolded.
Every day, my wife and I go to work during the day, and my mother-in-law takes care of the baby at home. After work, we both hold the baby, partly because we miss the child, and partly to give my mother-in-law a break.
That day when I got home, my mother-in-law was sitting in the living room holding the baby. I changed clothes, washed my hands, walked over, and reached out to tease the baby: 'Be good, let Daddy hold you.' My mother-in-law handed the child over. Because we were so close, my hand inevitably touched something very soft and large. After a momentary pause, I knew it was my mother-in-law's breast.
In summer, she only wore a thin nightgown, with no bra underneath at all. We both paused for a moment, a tiny electric current seeming to pass through our bodies. Mother-in-law's face quickly flushed slightly. To avoid awkwardness, I hurriedly took the baby: "Mom, you rest for a while, I'll soothe him."
My mother-in-law nodded, her voice sounding a bit unnatural: 'Alright, you father and son bond a bit. I'll go prepare dinner.' After saying that, she walked towards the kitchen with a hint of shy smile.
Watching her turn and leave, her summer nightgown perfectly outlined her curves. The sensation of that softness I had just touched still lingered in my palm. Some indescribable thoughts faintly ignited in my heart, but I immediately suppressed them—after all, she's my mother-in-law.
After dinner, the three of us coaxed the baby together in the living room. My eyes once again fell on my mother-in-law, this time from the perspective of a man looking at a woman.
A height of 1.62 meters, a slim wasp waist, giving her a petite figure. Black hair scattered over her shoulders, delicate features, big eyes, a straight nose, lips of moderate fullness. An oval face paired with a pointed chin—if this were twenty years ago, who knows how many men would have dreamed of her. Now, at forty-eight, she still makes it impossible to look away.
The nightgown's neckline wasn't small, fully exposing her fair neck and sexy collarbones. A pair of breasts, not exactly huge but sufficiently full, stood proudly on her chest. Remembering the sensation from earlier, I couldn't help but imagine them naked. My lower body involuntarily reacted.
Coincidentally, Mother-in-law got up to make tea. When she bent over to get a teacup, her collar opened, and a pair of snow-white breasts almost completely fell into my view. I swallowed hard.
“I’ll make you a cup too.” Her voice snapped me awake.
She turned and walked toward the balcony. From behind, the pink silk nightgown just covered her buttocks, the full curves slightly spreading the hem. Though slim, her forty-eight-year-old buttocks remained round. Those casual swaying steps carried more allure than any young girl's miniskirt.
After making the tea, she stood before me. I lowered my head, my gaze falling on her slender, straight legs and the small feet nestled in flip-flops. My wife had mentioned that my mother-in-law wears size 37. Her skin was fair and delicate all over, and this was especially evident in her feet. The skin on the tops of her feet was thin, with fine blood vessels faintly visible. Her toes were slender, and her nails were painted with a transparent pink polish that, under the light, looked like tiny grapes carved from pink jade.
The thing in my crotch hardened again. Because I was wearing shorts, I quickly changed my posture and picked up a water glass: 'Mom, you should rest, taking care of the baby all day is tiring.'
“It’s okay, baby, be good, I’m not tired. I’m just a bit bored being home alone all day. You all coming back to keep me company, and having more people around the house, would be nice.” She smiled and took a sip of tea.
"I've finalized the contract recently, so I don't have much to do. Tomorrow I'll hand over the work on my desk and come back to help you take care of the baby." I said.
My wife was busy dealing with company matters and casually responded with a few words. My mother-in-law's expression darkened slightly, and I quickly smoothed things over. After the atmosphere eased, my wife went to shower and sleep first. My mother-in-law and I watched TV for a while longer until the baby fell asleep, then she carried the child back to the room.
I lay beside my wife, my mind filled with images of my mother-in-law—her soft breasts, rounded buttocks, delicate toes. Thinking of this, I drifted into sleep.
The next day, I really went home early.
My mother-in-law was somewhat surprised but also very happy. While the baby was napping, the two of us sat in the living room chatting. She had changed into a lighter, more sheer house dress, the neckline still quite low. While talking, she occasionally looked down to tidy the baby's small clothes, causing the softness on her chest to sway gently.
I forced myself to look away, but my gaze kept drifting back involuntarily. My mother-in-law seemed to notice something but didn't point it out, only occasionally blushing and smiling.
Such days lasted for a week.
Every day, I come home early to help her with the baby and housework. The time we spend together grows longer. My mother-in-law naturally gets closer when I help, sometimes her hand inadvertently touches mine. Each touch feels like a tiny electric current.
What truly completely changed the atmosphere was a Thursday afternoon.
The baby is sleeping soundly. My mother-in-law sits on the sofa, and I sit beside her. The TV is on, the volume is low. She suddenly sighs: 'Sometimes I really feel old. Lili is so busy, you're busy too, leaving me alone with the child.'
"You're not old at all." I blurted out.
She turned to look at me, her eyes holding a smile and a hint of inquiry: 'So sweet-tongued. Just like your father-in-law when he was young.'
The air suddenly fell silent. I could clearly hear my own heartbeat. My mother-in-law's nightgown collar gaped slightly open due to her side-lying position, her snow-white cleavage faintly visible. My gaze uncontrollably fell downward.
She didn't immediately pull her collar closed, but instead asked softly, 'Have you seen enough?'
I suddenly looked up, my face flushed. But my mother-in-law smiled, though her ears were also red: "Anyway, you've already seen it once. That day when I handed you the child."
“Sorry...”
“No need to apologize.” Her voice was very soft. “It’s not like I don’t know what I’m wearing. You’re a man, looking a couple of times is normal.”
With things said to this extent, I actually got even harder. My mother-in-law's gaze fell on the obvious outline in my shorts. She was taken aback for a moment, then her face turned even redder. She didn't look away but instead said in a low voice, '...Very spirited.'
At that moment, the thread of reason snapped completely.
I reached out and held her hand. She didn't pull away. The next second, I kissed her.
The kiss started tentatively, then quickly deepened. My mother-in-law's lips were soft, carrying a faint scent of tea. Her hands initially pressed against my chest, but gradually they grasped my clothes. By the time we realized it, I had already pinned her down on the sofa. The shoulder strap of her nightgown slipped off, fully exposing one of her breasts.
Snow-white, full, the nipple already slightly erect. I lowered my head and took it into my mouth, gently licking with my tongue. My mother-in-law let out a suppressed moan, her fingers threading through my hair: 'Don't... the baby is still sleeping...'
“Then keep your voice down.” I raised my head and looked at her flushed face.
She didn't refuse again.
I pushed her nightgown up completely to her waist; she wore nothing underneath. The mature woman's body was fully displayed before my eyes—her flat stomach, neatly trimmed pubic hair, and the slightly parted slit. I probed with my fingers and found she was already wet.
“...Thought about it for a long time?” I asked softly.
She closed her eyes, her voice so faint it was almost inaudible: '...Ever since the day you touched me.'
As he entered, she bit her lower lip tightly. Inside, it was hot and tight, even better than I had imagined. I started slowly, afraid of hurting her. But she soon actively lifted her hips to meet him, her arms wrapping around my back.
Only suppressed panting and the faint sounds of flesh colliding filled the living room. The baby slept soundly in the crib. We both kept our voices to a minimum, which only made it more stimulating.
During ejaculation, I stayed entirely inside her. Mother-in-law lay limp on the sofa, chest heaving violently, tears of physical reaction at the corners of her eyes. I didn't withdraw immediately but lay on her, gently kissing her collarbone.
“What does this count as……” she suddenly spoke, her voice still a little hoarse.
“Count me as having fucked my mother-in-law.” I answered honestly.
She glared at me, but wasn't really angry. She just reached out and pushed me: 'Get up. What if Lili comes back early...'
We quickly straightened our clothes. Mother-in-law went to the bathroom to clean up, her face still flushed when she came out. She glanced at me and said in a low voice, '...What happened today, let's just pretend it never happened.'
I nodded. But both of us knew that once some things start, they can't be stopped.
From that day on, we reached an understanding.
As long as the baby is napping and my wife hasn’t come home yet, we’ll tangle around somewhere in the house. Sometimes it’s the sofa, sometimes the master bedroom, sometimes even the kitchen. My mother-in-law, who was passive at first, gradually became proactive. When I came in, she would pull me straight into the bedroom, take off her nightgown herself, and then straddle me.
A mature woman's technique and passion are completely different from a young girl's. She knows how to twist her hips, how to contract, and how to whisper things in my ear that make me lose control. Once, she was riding me, hands braced on my chest, controlling the rhythm herself, moving and saying, 'Much better than your father-in-law...'
I was stimulated and came directly.
My wife was completely in the dark. She was busy with work, and after coming home, she focused only on the child and resting. My mother-in-law and I coordinated seamlessly; during the day, we were just an ordinary mother-in-law and son-in-law, but at night, we would occasionally continue in her room.
Once my wife worked overtime until very late. My mother-in-law came out of the shower wrapped only in a towel and walked straight into my room. The moment the towel fell, I was already painfully hard. That night we did it twice. The second time, she asked for doggy style, her hands supporting the headboard, raising her butt high. I held her waist, thrusting in one after another, watching her mature body rise and fall beneath me.
After it was over, she lay face down on the bed, her voice muffled: 'If this continues... something will go wrong.'
I kissed her back: 'Then something will happen.'
She didn't speak again.
Summer passed in such secrecy.
The baby is getting bigger, but my mother-in-law hasn't mentioned going back. My wife is also used to having her mom at home to help. Only my mother-in-law and I know that this relationship has deepened to the point where we can't easily pull away.
One weekend afternoon, my wife took the baby to a friend's house. Only the two of us were left at home. As soon as I entered the door, my mother-in-law hugged me from behind, pressing her face against my back.
"Today... louder is okay." She said.
I turned around, picked her up, and carried her toward the bedroom. This time, there was no suppression, no tension of an affair. She moaned freely beneath me, her legs wrapped around my waist, climaxing again and again. After I came inside her, she still wouldn't let me pull out, instead actively contracting to keep everything inside.
Afterward she lay beside me, looking at the ceiling, and suddenly laughed: "Forty-eight years old, and still having an affair with my son-in-law. No one would believe it if I told them."
I held her hand: "Then don't say anything about it."
She turned over, looking at me seriously: 'Have you ever thought about what to do in the future?'
“I thought about it.” I answered honestly, “but right now I don’t want to stop.”
My mother-in-law remained silent for a long time, finally just burying her face in my chest.
The cicadas' chirping outside the window came in waves. In the room, only our overlapping breaths remained. Taboo was like the summer heatwave, tightly wrapping around the two. They both knew this heatwave would eventually pass one day, yet neither was willing to let go first.
Because within this heatwave, they possessed each other's most genuine desires.
Autumn came quickly.
The baby can already call 'Grandma' and 'Daddy'. My mother-in-law still lives at home every day, and my wife is gradually getting used to the rhythm of the three of us taking care of the child. On the surface, everything is normal—we have dinner together, take the baby to the park together on weekends, and go back to our own rooms at night. Only my mother-in-law and I know that the thin layer of window paper has long been broken.
Once my wife was on a business trip for three days.
On the night the news was confirmed, my mother-in-law was washing dishes in the kitchen, and I hugged her from behind. Her body stiffened slightly, then relaxed, allowing my hand to wander upward from her waist and cover her breast. Through the thin house clothes, her nipple was already hard.
“Lili isn’t here……” her voice was very low.
"So today, you don’t have to hold back." I bit her earlobe.
The bowls were still soaking in the sink when we did it in the kitchen. My mother-in-law leaned forward, hands braced on the countertop, as I entered from behind. She was wetter and tighter than usual. With each thrust, she would gently arch her back, suppressed moans echoing between the tiles. After finishing, she went limp in my arms, face buried in my chest, and after a while said, 'Let's go to the bedroom... I want to lie down.'
We barely went out those three days.
Take care of the baby during the day, wait for the baby to fall asleep at night, then close the door. My mother-in-law went from being passive at first to becoming more and more active. She would straddle me herself, hands propped on my chest, slowly rocking. Sometimes she would look down at where we were joined, eyes moist, voice trembling: 'All... all the way in.'
I can't stand it when she does this. Every time, I get stimulated and cum early, and then she laughs and pinches my nose, saying, 'So fast? Weren't you pretty good at holding back before?'
“It’s all your fault.” I said matter-of-factly.
She would lower her head to kiss me, and as she kissed, she would start moving again. Once a mature woman's body lets go, the passion is astonishing. She knew how to contract, how to twist her hips, how to whisper things in my ear that I would never normally hear. Once, when she was riding on top of me, she suddenly looked at me very seriously and said, 'Your father-in-law hasn't touched me in a long time. You're... much gentler than him.'
That sentence made me feel both pleased and uncomfortable inside. I turned over and pinned her beneath me, entering her deep and hard. Her legs wrapped around my waist, her hands grabbed the bedsheet, and she called my name over and over.
The night before the wife returned, we did it for a long time.
It was as if all the time that might be lost next had to be spent in advance. My mother-in-law cried, but not because she was sad—because the pleasure was too intense. After I came inside her, she still refused to let me pull out, and instead tightened around me on purpose, keeping everything inside.
“Wait until Lili comes back...” She buried her face in the crook of my neck, her voice muffled. “We still have to be careful.”
I kissed her hair: 'I know.'
After the wife returned, the atmosphere at home became 'normal' again.
My mother-in-law reverted to being the gentle grandmother, and I reverted to being the ordinary son-in-law. The three of us ate together, watched TV together, and took care of the baby together. Only at night, when my wife was asleep, would I occasionally slip into my mother-in-law's room. We had to keep all sounds to a minimum, and movements had to be extremely careful. But the more it was like this, the stronger the thrill.
Once we were almost discovered.
The wife got up in the middle of the night to drink water, and I had to hide in the wardrobe. The mother-in-law quickly straightened her clothes and pretended to be sound asleep. After the wife lay back down and started snoring, I came out of the wardrobe, pressed the still shaken-looking mother-in-law back onto the bed, and did it once more, fast and hard. After finishing, she buried her face in my chest, her shoulders trembling slightly.
"So dangerous..."
“But I’m so excited.” I bit her earlobe.
She did not refute.
Winter has arrived.
The baby is getting more clingy, but my mother-in-law hasn't mentioned going back. My wife is also used to having her mom at home to help. Only my mother-in-law and I know that this relationship has deepened to the point where we can't easily pull away.
One snowy night, my wife took the baby back to her parents' house to stay overnight. Only the two of us were left at home. As soon as I entered the door, my mother-in-law hugged me from behind, pressing her face against my back.
"Today... louder is okay." She said.
I turned around, picked her up, and carried her toward the bedroom. This time, there was no suppression, no tension of an affair. She moaned freely beneath me, her legs wrapped around my waist, climaxing again and again. After I came inside her, she still wouldn't let me pull out, instead actively lifting her hips and whispering, "One more time... I want you to give me one more time."
So we started again.
The snow outside the window fell heavier and heavier. Only a very small lamp was lit in the room. The movements gradually shifted from urgent to slow and affectionate. This time, there wasn't much of the impatience of lust, but more of confirming that the other was still there.
During ejaculation, I pressed to the deepest point and whispered: 'Can you continue?'
My mother-in-law nodded, actively contracting: 'Keep going. I want you to fill me up.'
So they got tangled up again.
When the snow stopped, the sky was already bright. My mother-in-law lay beside me, looking at the ceiling, and suddenly spoke: 'If this continues, something will happen one day.'
I held her hand: "Then something will happen."
She turned to look at me, complex emotions in her eyes: 'Have you ever thought about what would happen if Lili found out...'
“I thought about it.” I answered honestly, “but right now I don’t want to stop.”
My mother-in-law remained silent for a long time, finally just burying her face in my chest.
Spring arrived once again.
The baby is already over a year old, can walk, and can call people. My mother-in-law still lives at home. My wife's job is getting busier, often working late into the night. I actually spend more time with my mother-in-law.
Sometimes in the afternoon when the baby naps, we would do it once in the master bedroom. Sometimes in the evening when my wife hasn't returned yet, we would tangle on the living room sofa. My mother-in-law grew bolder, from her initial cautiousness. She would pull me into the room as soon as I entered, take off her clothes herself, and then straddle me.
Once a mature body fully lets go, its passion is almost overwhelming. She knows how to make herself comfortable and how to make me lose control. Once, she was riding me, hands braced on my chest, controlling the rhythm herself, moving and saying, 'Much, much better than your father-in-law... He never made me feel like this.'
I was stimulated and came directly. But she didn't stop, continuing to rock slowly until she also climaxed, then collapsed softly on top of me.
Afterward she lay on my chest, listening to my heartbeat, and suddenly said softly: “I think... I’ve really fallen a little in love with you. Not in the mother-in-law kind of way.”
I held her close and kissed her forehead: 'Me too.'
Summer has arrived once more.
The weather was getting hotter and hotter. My mother-in-law at home still only wore a thin nightgown, often without underwear underneath. Every time she bent over, every time she turned, it felt like a silent provocation. I was completely lost. Just one look from her, and I would get hard.
One weekend, my wife took the baby out of town to attend a class reunion and wouldn't be back for three days. Once again, only the two of us were left at home.
I barely went out these three days.
Take care of yourself during the day, close the door at night. My mother-in-law went from being passive at first to completely active. She would prepare herself, actively request positions, whisper things in my ear that made me blush and my heart race. Once she lay on the bed, raising her butt high, looked back at me, her voice soft, unlike a mother-in-law: 'Come in... I want all of you inside.'
I held her waist, thrusting in repeatedly. Her mature body rose and fell beneath me, her breasts swaying gently with each impact. Her moans were no longer suppressed, echoing one after another in the room.
Afterward she lay beside me, looking at the ceiling, and suddenly smiled: “Forty-eight years old, and still having an affair with my son-in-law. No one would believe it if I said it out loud.”
I held her hand: "Then don't say anything about it."
She turned over, looking at me seriously: 'Have you ever thought about what to do in the future?'
“I thought about it.” I answered honestly, “but right now I don’t want to stop.”
My mother-in-law remained silent for a long time, finally just burying her face in my chest.
The cicadas' chirping outside the window came in waves. In the room, only our overlapping breaths remained. Taboo was like the summer heatwave, tightly wrapping around the two. They both knew this heatwave would eventually pass one day, yet neither was willing to let go first.
Because within this heatwave, they possessed each other's most genuine desires.
And the story was still continuing.
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