They are both biological sisters and scheming sisters.

Actually, I hesitated for a long time before writing this. Is this... considered pathological? Or perverted? Or just an outlet for lust?

My mother-in-law and I have been married for almost ten years, and our sex life is very normal and regular, averaging once every 2-3 days. Her three sisters all married young, and they discuss sex with each other. My mother-in-law often reveals that her younger sister complains to her about how long it has been since she had sex, and envies my mother-in-law for being well-fed. Every time my mother-in-law says this, I add, "Well, maybe I'll condescend to help her a little, since you can't use it all anyway." Then my mother-in-law will squeeze harder. It's been about two years since I said "I'll just say it" to my mother-in-law.

Last year, during the Mid-Autumn Festival, we went back to my parents' house for a barbecue. The three sisters gathered together and chatted about their daily lives. Actually, all three sisters are relatively short, around 156 cm. The eldest sister is taller, but she's too thin, and unlike my sister-in-law, she doesn't like to chat with me. My sister-in-law's figure is almost exactly the same as my mother-in-law's, 156.49 cm, B cup. The two sisters often swap clothes, so you can't really tell them apart from behind. When I was dating, I called my parents' house to see my mother-in-law, and my sister-in-law answered the phone. I always called her "Darling." My sister-in-law paused for a moment and said, "Sister, your phone is on." My sister-in-law's voice on the phone was almost identical to my mother-in-law's, so I couldn't recognize her!

But because of this, I also had a lot to talk about with my sister-in-law. She was very polite to me, and she would always add "brother-in-law" before asking me anything. When I talked to her, she would look at me very seriously...

Oh right! Back to the Mid-Autumn Festival barbecue! I drank a bit too much that night, so I stayed at my parents' house for the night. There were no beds in the guest room, so we slept on the floor using two large mattresses. I was a bit tired and had been drinking, so I went upstairs to sleep early, around 10 pm. I don't know what time it was, but my wife came up to sleep after the barbecue. I was so tired that I didn't want to wake up, so I pretended to be dead and didn't want to help clean up the barbecue equipment. I don't know what time it was, but I started to feel the urge to pee because of the beer, so I had to get up to go to the bathroom. Oh, so hard... When I got back to bed, I found that I still couldn't get rid of the erection, so I decided to sneak up on my wife! My wife was sleeping with her back to me. I started by putting my arms around her waist, then my hand slid down to knead her buttocks. Next, my fingers gently caressed her vulva in one smooth motion. Because this was a body I knew very well, I half-pushed off her pants, and my penis slid down her buttocks, then I inserted my hard penis inside her. Then I started kneading her breasts. "Oh, so wet..." I thought to myself, hadn't my wife just made love yesterday? "It's getting wet so quickly again, the more you eat, the bigger it gets!" I started thrusting, and suddenly my wife slapped my butt. I thought, "Will it hurt? But it's so wet and slippery!" So I slowed down and started twisting my butt to get closer to her clitoris, but she kept slapping my butt and trying to push me away. Suddenly, my "wife" spoke up: "Brother-in-law! It's Qingla!" "You're treating me like your older sister!"

A thunderbolt! I was speechless!

Next, I immediately pretended to be dead, pretended to be asleep… But I kept praying, "Let me ejaculate prematurely this time! I really want to ejaculate inside my sister-in-law's body." However, after a while, my sister-in-law made sure I wasn't moving anymore, so she pulled her buttocks back, and my hard penis slid out of her body. My sister-in-law put on her pants, looked at me closely, and then continued to sleep… I pretended to be asleep until I actually fell asleep, not daring to breathe!

The next morning, I found that we were sleeping like this: "My wife and my sister-in-law." I probably went to the bathroom in the middle of the night and slept in the wrong position, and I mistook my sister-in-law for my wife and almost consummated our marriage!

I got up to take a shower, but I still couldn't help putting a glove on my penis and smelling my sister-in-law's scent. Hmm! There was a faint scent! Not erotic!

However, it was a kind of aphrodisiac that could excite people, and it came from my sister-in-law's most private place. After she finished showering, my sister-in-law got up, and she was wearing my mother-in-law's clothes!

It's only natural that I would admit my mistake! Although I didn't turn on the lights last night, my sister-in-law still politely greeted me with "Good morning, brother-in-law." After I washed up, she busied herself asking what I wanted to eat and offering to prepare breakfast for me. It seemed that what happened last night had been resolved, as she didn't mention it again. I assumed she had forgotten about it, but... this was the beginning of an affair that is still ongoing. I'll write it down slowly as I feel more comfortable. I also want to record it as part of my diary...

About a month after this incident, after I finished having sex with my mother-in-law, we got up to shower and wash away my sweat and the semen that had sprayed all over her. Lying on the bed, my mother-in-law said she felt very relaxed and let out a long sigh. "Ugh... Ah... that was so good..." I said. "Was it that good? I was really putting in a lot of effort." "You deserve to enjoy it..."

Suddenly, my wife sighed. "What's wrong? Not enough? Want to go again?" My wife: "No... it's Qing..."

Hmm... my sister-in-law. I suddenly remembered that day when I accidentally penetrated her and even rubbed her breasts... I felt a little apologetic but also excited. "She... what's wrong with her?" I asked calmly. "She said she's like a resentful woman." Actually, my sister-in-law is ten years younger than her husband. She got her current husband pregnant less than half a year after graduating from university and then got married, so she has very little sexual experience... No! There was only one person, her husband. They'd been married for 10 years, and his wife was just over 30, at the peak of her sexual desire. But her husband was impotent. I asked my wife, "What did Qing do?"

She said, "My brother-in-law bought Qing an electric one to play with..."

"And then? Did Qing use it?" I asked curiously.

"Yeah... he used it... and then? Of course, a real one is better..."

It's obvious how an electric dildo can compare to a real one... and it's noisy... sex isn't just about penetration... After a pause, my wife said, "Why are you asking so many questions? Are you going to help?"

I was speechless. Although I couldn't say it, I was secretly very happy to help!

The next day, my mother-in-law suddenly messaged me on MSN

: "Qing is coming up to visit us this week."

I asked, "What are we going to do? Just eat and drink, maybe go to Bisha Beach in Keelung for some fresh seafood." She replied,

"But Qing has to come on Friday." I asked

, "Huh? Why?" She said,

"She happens to have Friday off, so you can take her out to play..."

I said, " ..." She said,

"Okay, my dear sister is in your care. " I said, "..." I said, "So, what do you want to do?!" She said, "Look at my sister... We went to wego before, it was pretty good, or there's ido near our house..." I said, "..." I said, "Are you serious?" She said, "Do I look like I'm joking? I'll add Qing on MSN for you later..."" Suddenly, I realized MSN can be used like this! Anything you're too embarrassed to talk to face-to-face, you can just type it out. No wonder my colleague said his wife divorced him on MSN and even sent him an electronic copy of the divorce agreement. Anyway, I added my sister-in-law to MSN to chat and see if my wife was playing a trick on me. After confirming the time with my sister-in-law on MSN and confirming she would come online, I felt a mix of nervousness and anticipation! On one hand, I couldn't understand why my mother-in-law wanted me to have sex with her sister?" The night before my sister-in-law came to visit, I wanted to make love to my wife, but my mother-in-law spanked me and said, "Save it for Qing tomorrow! Bring Qing back to play! I'll get the room ready." That day, my sister-in-law took the High Speed Rail to Taoyuan. When I saw her at the station, she was wearing a white dress with red polka dots and sandals, revealing her fair legs. I thought to myself, "Later, I must put your legs on my shoulders and penetrate your hole properly..." Thinking about what was about to happen, I got an erection! "Brother-in-law! I'm here!" My sister-in-law saw my car, waved to me, and walked over quickly. My sister-in-law and I had something to talk about, so there was no awkwardness on the way home.

I brought my sister-in-law back to my house, made her a cup of coffee, and while serving her, I leaned close to her ear and lightly touched her lips, then kissed her cheek, and touched her shoulder, hand… waist and butt…

“Brother-in-law… are we staying at your house?”

“No problem, no one’s home during work hours today.”

“I mean… in your and my sister’s bed… okay?”

I thought to myself; your sister has already lent you her brother-in-law, do you think she cares about this? And going to the MT at 11 am is really a bit awkward!

But my sister-in-law didn’t object, so I half-jokingly pushed her into the room. To avoid awkwardness, my mother-in-law had drawn the curtains early in the morning, changed the sheets to my sister-in-law’s favorite Tiffany blue, and even prepared scented candles and condoms, which was more thoughtful than the MT!

I half-jokingly pushed my sister-in-law down on the bed and began to gently breathe into her ear, kissing her face and lips, then starting a wet kiss and lip-smacking. This was very similar to my wife, who also enjoys kissing and lip-smacking! I loved it too. My hands began to roam over my sister-in-law's body, unbuttoning her bra and kneading her breasts, then teasing her nipples with my tongue. My sister-in-law's hands were busy unbuttoning my shirt. I slowly moved down to lick the warm, wet area between her legs. My sister-in-law seemed to be overflowing with desire; her face was flushed, her hands weak as if she wanted to struggle, then she gripped the sheets tightly, twisting her lower body. I removed her last piece of clothing and placed a pillow under her buttocks so I could properly admire and caress her vulva. Her vulva resembled my mother-in-law's! However, my mother-in-law's labia minora are uneven, though not by much, and they are quite thin. I like to gently suck on them and make a squeaking sound. My sister-in-law's labia minora are also thin, but smaller. I plan to play with her vagina the same way I did with my mother-in-law's, sucking her labia minora until they make a squeaking sound. My sister-in-law reacts as if she's been electrocuted, her buttocks twisting as if trying to escape my tongue's attack. "Ah... brother-in-law... so comfortable... mmm... um..." my sister-in-law moaned, enjoying the pleasure my tongue gave her,

but she still didn't forget to call me brother-in-law.

Next, I started licking her clitoris. My sister-in-law's clitoris is the same as my mother-in-law's; it's not very prominent. It gets hard when you really want to stimulate it. I started using the tip of my tongue to tease it. My sister-in-law was already wet, but her fluid was quite thick and tasteless. I stretched out my tongue and pressed the whole tip against her vulva to lick it dry. My sister-in-law seemed to not want me to drink her fluids, and kept trying to pull me up, calling out, "Brother-in-law, don't pull me..."

Then I used the tip of my tongue to circle and probe her clitoris again. My sister-in-law looked like she was close to climaxing...

I inserted my middle finger into her vulva and slid it back and forth, my tongue never stopping. I slowly inserted my middle finger into her wet vulva, bending it and probing inside her warm flesh. "Uh..." I suddenly noticed that, like my mother-in-law, there was a rough crease between the two joints of my finger. I love playing with my mother-in-law like an old man in a doggy style, where I don't have to insert it deeply but just a shallow insertion, letting the glans rub against that crease. She gets pleasure, and so do I! My sister-in-law's was a little deeper; then I inserted my ring finger as well, and started rubbing my fingers in circles around her folds, and then gave her a snake kiss. My sister-in-law's fluids were thicker, and my hands were covered in her fluids. Now it was my turn to have my penis in!

I spread my sister-in-law's legs, gripped my penis, and aimed it at her vagina, ready to insert it. "Brother-in-law," I knew what he was going to say. Before I knew it, my penis was fully inside her... I gave her a deep kiss, thinking, "You want me to use a condom...?" I pressed myself against my sister-in-law, our private parts tightly joined together. I kissed her while circling her hips, my penis deeply penetrating her vagina. After playing for a while, my sister-in-law's vagina remained slippery and wet, and she started moaning, seemingly enjoying my penis. I then moved my hands to her buttocks... I held her buttocks firmly with both hands, making sure she had nowhere to escape, and began to thrust heavily into her vagina, making a slapping sound. "Ah...brother-in-law...ooh...ooh..." I held her buttocks; my sister-in-law's vagina had nowhere to hide. She could only be pounded hard like mochi, unable to escape. The head of my penis slammed directly into my sister-in-law's clitoris. My sister-in-law's moans gradually subsided after the initial excitement, indicating that she had gotten used to this kind of thrusting. I got up, pulled out my penis, and grabbed her fair calves with both hands, gently stroking them with my fingers and kissing her calves. I saw that my pubic hair was already wet with my sister-in-law's fluids.

"Was it comfortable?"

"It was very comfortable... but brother-in-law has to wear a condom..." My sister-in-law, whose face was still flushed from being fucked by me, said in a coquettish voice...

"Didn't you use contraception? I just ejaculated inside you!" I deliberately spread her legs, pretending to dig the semen out of her body. Of course, I knew she was using contraception, so I was just teasing her.

"Brother-in-law, you're so annoying..." My sister-in-law wasn't used to spreading her legs for me, her brother-in-law, to admire her beautiful vulva, so she nervously closed her legs. But I grabbed her ankles and pried her legs open, trying to insert my penis again. I put a pillow under her buttocks so she could watch my penis enter her body. I saw her staring at my penis as it entered her body. "Qing... is your brother-in-law's penis big? Does it feel good inside?" My

sister-in-law's face was flushed, and her eyes were a little dazed... "Mmm... I'm almost dying of pleasure..."

Next, I hung my sister-in-law's fair and pink legs on my shoulders, pushed my buttocks forward, and pressed my glans tightly against her cervix. The depth of my sister-in-law's vagina was the same as my mother-in-law's!

Sisters are indeed sisters! During the act of making love with my sister-in-law, I had this persistent feeling that she resembled my mother-in-law, yet not quite. Her scent was different from my mother-in-law's, but there was a similar quality. I sniffed under her armpit, inhaling her faint fragrance. A surge of excitement rushed to my head, and I couldn't help but thrust my hips forward, repeatedly rubbing and rubbing my penis against her cervix. My sister-in-law gripped my arm, biting her lip, her breath sweet and fragrant as she sighed softly. The two sisters were just like that! Moans are usually just low groans, but my sister-in-law only let out "Mmm... Ah..." She was close to climaxing, and I stopped, not wanting her to climax so soon, but it was too late, she came, her body slightly sweaty and panting, and she loosened her grip on my arm.

"Did you enjoy it?"

My sister-in-law was still dazed, only nodding, her face beautiful with a rosy glow. I couldn't help but kiss her cheek, then slipped my tongue into her slightly parted lips. My sister-in-law responded, and we started kissing passionately again, still intertwined...

"Qing, do you want to be on top?"...

I wanted my sister-in-law to be more proactive and have more fun, and I also wanted to see how she would enjoy herself on my penis, so I made this request. "Hmm..." My sister-in-law pursed her lips, her eyes darting around. I lay down, took her hand, and gestured for her to sit on top. My sister-in-law didn't hesitate, climbed on top of me, skillfully held my penis, and slowly sat down. My entire penis was deeply inserted into her honeypot, and she came wet again... Oh... my sister-in-law's wet, slippery, and warm pussy, we were united once more. My sister-in-law started gently twisting her hips on top, back and forth and turning in circles. My penis was churning inside her. "Mmm...uh..." Her movements became more and more vigorous, and the frequency of her hip swaying increased. She started rubbing her breasts with her hands, closing her eyes and enjoying the pleasure of my penis inside her. However, she didn't sit all the way up so that my penis would reach her clitoris, so I held her waist and pressed her body down so that the head of my penis would hit her clitoris. "Oh...brother-in-law...so deep...oh...brother-in-law..."

"Does it hurt? Or does it feel good?" I was worried that I was really hurting her...but I also liked the way she begged for mercy from her brother-in-law!

My sister-in-law's face was flushed red. "It feels so good...it hurts...it feels amazing..."

Haha...I was secretly thrilled. I had conquered my sister-in-law. I felt an indescribable joy. No! I should say amazing!

I've conquered both my sisters! Amidst her increasingly rapid breathing, she climaxed. It seems this little girl also enjoys sex, but no one has satisfied her. After her climax, she lay on top of me like a deflated balloon. I felt a warm fluid flowing from deep within her, making my glans tingle... My sister-in-law was limp, so I had to let her lie flat...

"Brother-in-law...do you still want to play?" The sister-in-law's voice was weak, and the blush on her face against her fair skin was truly alluring.

"It's okay, Qing, you should rest if you're tired. Do you want to take a shower?"

"Mmm...Brother-in-law, you're so considerate...I haven't played like this in so long..."

"If you want it, just do it...I'll get you some tissues to wipe yourself off..."

"Brother-in-law, did you ejaculate?" the sister-in-law asked!

"No... I'm just wiping away the fluid that came out..."

"So shy... Brother-in-law is so considerate." "Heh... it tickles..."

I spread my sister-in-law's legs apart, separating her two lips, and couldn't help but bring my mouth to lick them again, making my sister-in-law giggle happily...

I paused for a moment...

"Brother-in-law, do you want to cum?"

"Hmm?" I drawled...

"You don't want to cum?" my sister-in-law said.

"Yes, but... Qing... did you enjoy it? I'm afraid I'll tire you out..."

"Hmm... I'm satisfied... let it be your turn to have some fun! But brother-in-law can't keep going for so long." "I can't take it..."

"Does it hurt or feel uncomfortable?" I was afraid that I had hurt my sister-in-law by being too rough just now!

"It feels so good... but my legs are all weak..." My sister-in- law stuck out her tongue playfully.

After drying the water from her vulva, I put on a condom and inserted myself into her cunt again. Her cunt was a little red and swollen, the kind that's been thoroughly fucked. I admired it for a moment, then put on the condom. With the condom on, it wasn't as sensitive, so my thrusting became more vigorous, and the sounds of our bodies colliding grew louder, filling the entire room with "slap slap slap" sounds... I

don't know if it was because I was using too much force or because my sister-in-law was already full, but she didn't seem as passionate as before.

My sister-in-law whispered in my ear...

"Brother-in-law," please don't use a condom and ejaculate inside me, okay? "

Hehe," since my sister-in-law had spoken, I, as her brother-in-law, had no choice but to

comply. Afterwards, she said it had been too long and she was worried I'd be too exhausted to give her sister sexual satisfaction that night. What a considerate sister! My penis was inside her again, the wet, hot vagina making my glans tingle. I knew I wouldn't last much longer, so I started thrusting faster. "Qing, I'm going to cum... oh..." The tingling sensation in my glans began to wash over my entire body...

"Mmm... Brother-in-law... Give it to me... Brother-in-law..."

Finally, I ejaculated inside my sister-in-law. I held her tightly, letting my hot semen completely penetrate her depths...

My sister-in-law hugged me, her fingertips lightly touching my back... I buried my head in her chest, inhaling her scent, enjoying the warmth after my orgasm. She was a little sweaty...

I didn't know if it was mine or hers, but I guessed it was mostly mine. Like her sister, my sister-in-law didn't sweat much, and her orgasms were easy to tell; you could feel her body starting to sweat a little. That's it...

I changed positions and hugged her from behind, then lay down on my side. My penis was still inside her. I was afraid the semen would leak out, so I continued to gently caress my sister-in-law for afterplay. My sister-in-law was completely satisfied, exclaiming that I was so sexually blessed...

However, the only downside was that we didn't orgasm together, so it was a little imperfect. Also, I originally wanted to enjoy watching my semen flow out of my sister-in-law's body after I ejaculated inside her, but I didn't see it because she got up to rinse off!

After we finished, I watched my sister-in-law go to catch the bus back to Taichung. On the way, she called my mother-in-law to thank her for generously lending me, her brother-in-law. After getting off the bus at the station…

“Brother-in-law, wait for me a minute!”

I watched as my sister-in-law, wearing a little dress, ran to a 7-Eleven and grabbed half a dozen chicken essences for me…

“Brother-in-law, thank you! This is to replenish your energy!” My sister-in-law is just so polite and likable.

I watched her get on the bus. “Come visit again sometime!” But as soon as I said that, I felt a little awkward!

On the way home, I received another text message from my sister-in-law: “Thank you, sister and brother-in-law! I had a lot of fun.”

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They are both biological sisters and scheming sisters.

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