I slept with my wife's younger sister, and my wife even thanked me.

Let me introduce myself. My name is Du Kang, but people usually call me A Kang. I'm 33 years old this year. We'll be celebrating our 10th wedding anniversary at the end of the year. My wife is the same age as me, and our child just started elementary school. Our family is warm and happy. My wife's younger sister is 6 years younger than us, 27 this year. The age gap is a bit large, but everything has been fine until recently, when something happened during her artificial insemination . It's something I still remember vividly!

My sister-in-law, Miroa, got married at 23, but after three years of marriage, she still hadn't conceived. Her parents were very anxious, and my wife even asked me to bring back some special medications from her trip abroad, but none of them worked. Later, I asked my wife to secretly ask her younger sister if her husband had any problems with his sexual function. To be honest, I had my own ulterior motives when I asked her to ask: objectively speaking, my sister-in-law isn't as pretty as my wife, but she's 6 years younger than us, very youthful, and has a very fit figure—you often imagine how taut her skin would feel. If her husband has a problem with his sexual function, wouldn't that give me a great chance?

My sister-in-law and brother-in-law had a whirlwind marriage; she only met her boyfriend a few months before the wedding. So, before she had a boyfriend, she often came to our house, especially in the summer. She was very casual at her sister's house, running around in my wife's nightgown, clearly not wearing a bra, which always made my "little brother" secretly uncomfortable. Also, our bathroom door had a nail hammered in when we first renovated to hang a decorative thermometer. Later, the thermometer was removed, but the nail left a small hole through which I could see everything inside the bathroom. Before my wife noticed, I quickly pasted a picture of her favorite celebrity on it. This hole was my source of amusement many times when I spied on my sister-in-law showering. Back then, she clearly had a girl's body; her breasts weren't large, but the nipples were large, round, and firm; her pubic hair was thick, shaped like a trimmed Arabic numeral "1". Because the hole was so small and high up, I never clearly saw what her pubic area actually looked like. This thrilling act of voyeurism ended with her marriage…

I once wondered if my sister-in-law, living in a large family and seeing me frequently, might have developed feelings for me, given her naivety as she was the first young man she encountered most often. However, an incident later shattered this hope: One day, she and her brother-in-law came to my house. I had just returned home and was changing into my pajamas in my bedroom. I had only taken them off down to my underwear when, for some reason, my sister-in-law came in without knocking to get her sister's skincare oil. When she saw me dressed like that, she exclaimed, "Ah!" I awkwardly said, "It's okay, I'm not naked." She nonchalantly replied, "Hmph! Who cares!" and left. Furthermore, in the summer, when Miroa wore low-cut clothes, whenever she bent over in front of me, she would instinctively cover her chest with her hands, as if afraid her brother-in-law would see, just like the subconscious actions of those strange women I'd seen outside. From then on, I concluded that she only saw me as a brother, and I never harbored any further expectations.

Later, one weekend, my wife came back from her younger sister's house. Afraid the kids would overhear, she secretly pulled me aside to the nanny's room and told me that she had asked her sister and heard that although her brother-in-law wasn't very vigorous, he was a normal man who could have sex. Her sister-in-law had also been to the hospital, and her physical functions were fine; there were no problems like blocked fallopian tubes or uterine adhesions. My wife told me to think of a solution, otherwise her parents would worry too much. I had no choice but to follow her orders and inquire around. Later, I heard from a friend who worked at a hospital that even if a man's erection and ejaculation were fine, if the semen concentration was insufficient or there were no live sperm in the ejaculate, he still couldn't conceive.

I told my wife this news, and a few days later, she told me that her sister had forced her brother-in-law to get checked, and it turned out he really had azoospermia! The young couple were preparing to undergo artificial insemination. But my wife said she had an embarrassing request for me to agree to: she hoped I could donate my sperm. Her younger sister felt that although the sperm provided by the hospital was supposedly donated by healthy men with at least a college degree, Miroa was worried that if the man was too ugly, it would harm the next generation. Besides, her brother-in-law was so handsome, and her sister's child was so beautiful and intelligent; she felt that using my sperm would definitely result in good genes, and the child would have a true family relationship. She just wanted to keep it a secret from her parents, as they were worried their traditional values wouldn't accept it.

I said, "Wife, if you have no objections, of course I have no objections! Haha, I'll have another child!" My wife said, "You wish! You absolutely mustn't tell the child. Firstly, to protect the child's feelings, and secondly, this is a condition her younger sister agreed to with her brother-in-law." The next morning, her younger sister called me: "Brother, thank you! I finally managed to convince my sister yesterday, but I was worried you might not agree!" "How could that be? Which hospital do you need to go to for sperm collection? I can go today." "I'll answer." It was in Xiaofang's department. "Ah, Xiaofang!" I really didn't expect to hear Xiaofang's name. Because Xiaofang was Miroa's classmate, working in the obstetrics and gynecology department of a large hospital in our city. I had asked her husband to help us buy a phone before, and we had dinner together. "But why would sperm collection require me to go to the obstetrics and gynecology department...?"

I asked my sister-in-law in surprise. "Brother... it's like this, it was Xiaofang's suggestion. Since I chose someone close to me to donate sperm, we shouldn't use frozen sperm like usual, because that would cause some sperm to die and affect the conception rate... You see, I'm even embarrassed to say this..." Miroa stammered, explaining. "Well, okay, no problem." I thought to myself, whatever, I won't gain anything from my sister-in-law anyway, it's just that the sperm skipped the liquid nitrogen flash-freezing step. "Then please don't drink or smoke these days, okay? For the sake of your future nephew!" Brother-in-law! "My sister-in-law seems much more relaxed now." Quitting alcohol is no problem, but quitting smoking will really take some effort. "I thought to myself, she's not some nephew, she's clearly doing this for my 'son'." "Thank you, brother-in-law. Then in two weeks, let's go to Xiaofang's place together." "After hanging up the phone, I subconsciously stubbed out the half-smoked cigarette.

A week later, because my wife was away on a business trip, it was just my sister-in-law and her husband who went to the hospital. Once inside, Xiaofang blocked her brother-in-law outside the OB-GYN operating room 3. Then my sister-in-law went into the operating room to prepare, and I was led to an instrument room attached to the operating room. Xiaofang told me that this wasn't like the sperm collection room in the urology department of a hospital; there were no stimulating videos to watch, and I had to figure out how to get the semen out myself and put it into a glass container she gave me. Xiaofang left, and seeing that it was a bit hot, I completely took off my pants, took out my 'treasure,' and told it, 'You'd better perform well today and give me some high-quality seed.' Then I slowly started masturbating. Although I knew my sister-in-law was right next door, and maybe she wasn't wearing anything down there and my little brother would immediately stand erect, it wasn't very interesting to be 'karaoke' alone like this. I masturbated for 10 minutes and still showed no sign of ejaculating. 'Squeak!'" "The door suddenly opened, and Xiaofang quickly slipped in. I was still stroking my penis. I was too scared to contact her without permission. I never expected that my little brother would be so firmly held in her hand today... My little brother was throbbing uncontrollably.

" "Brother Kang, I didn't expect your penis to be so big, it's really rare! But your foreskin seems a little long." Xiaofang stroked my penis back and forth with her hand while looking at me with a strangely tender gaze. "It's okay, it's only noticeable when it's flaccid. You see, when it's erect, the foreskin retracts completely. It won't affect the quality of our sex life, will it?" To be honest, I never thought of it as a problem before. "Who says it's okay? A slightly long foreskin can also trap dirt and grime. Also, because it's usually covered by the foreskin, the glans penis, which is suddenly exposed during erection, can't withstand strong stimulation and won't last long." "Xiaofang was very professional when she said that." Oh, to be honest, that's something I'm insecure about. Although my penis is bigger than average, I usually ejaculate within 10 minutes of penetration. So that's why. "It's nothing. Come back later, and I can even do a circumcision for you. It's just a minor surgery."

After Xiaofang finished speaking, she carefully used a cotton ball soaked in saline solution to wipe the coronal sulcus near my glans. Her face got closer and closer to my penis, and just as Xiaofang's lips were about to kiss my penis, the door creaked open again, and my sister-in-law Miroa walked in unexpectedly. "Xiaofang, what are you doing?" my sister-in-law asked, seemingly a little unhappy. Xiaofang subconsciously covered my penis with her hands, but her hands were too slender, only enough to cover the penis itself, leaving the scrotum completely exposed. My sister-in-law was staring at it intently, completely unlike the indifferent expression she had when she saw me changing clothes last time. This made me very uncomfortable, and I grabbed a crumpled pair of pants and covered my bare legs. "Oh, this is too unprofessional. Kang Ge's sperm can't be ejaculated. I'm going to use rectal stimulation of the prostate to help Kang Ge ejaculate." Xiaofang reacted quickly, her calmness highlighting my panic. "Xiaofang, I want to ask you, what will you use to put my brother-in-law's semen into my body later?" My sister-in-law seemed a little uneasy about the procedure, but her eyes were still fixed on Xiaofang's hands covering my penis.

"We have a special insemination device, don't worry. We perform hundreds of artificial insemination cases a year, experience and sterilization are no problem." Xiaofang remained squatting. "What is that device made of? Is it cold?" Miroa also squatted down next to Xiaofang. Because she was wearing a surgical gown with a large opening at the chest, I could clearly see her very deep cleavage. My penis started to move again, suddenly popping out between Xiaofang's hands, and Xiaofang quickly covered it with her hands again. "Yes, it's an alloy, but I can warm it up for you so it won't be too cold." "Xiaofang, I have a favor to ask. I don't want that metal thing inside me. I want a son. I heard that the chances of a woman conceiving a son are higher when she orgasms. So, please let your brother-in-law insert it directly into my body, but please don't tell Xiaotao (my brother-in-law's name), okay? Please, just for your nephew!" My sister-in-law pleaded, and her right hand quickly reached for my scrotum, gently rubbing my testicles with her fingers. "We're siblings, it'll be so awkward if we do this later." Although I was more than willing, I still said this against my will. "This is a special case, a special treatment. If you don't tell, I don't tell, Xiaofang doesn't tell, and my sister won't know either, brother-in-law!" My sister-in-law's right hand had already pushed Xiaofang's hands apart and gripped my penis tightly. My penis had already involuntarily trembled several times. "Alright then, but we need to go to the operating table; the hygiene conditions here aren't right!" Xiaofang said, then snatched my penis back from her sister-in-law's hand. I quickly found a way to back down, stood up abruptly, saying it was too hot, and took off my shirt as well, walking naked out of the operating room.

My sister-in-law quickly followed me out, lay down on the bed, and spread her legs, placing her two fair and tender legs on the support of the delivery bed. At this moment, her entire vulva was truly exposed before my eyes. Although I had peeked at her pubic hair before, this was the first time I had seen her labia majora and labia minora, and so closely. If only I could have measured my blood pressure at that time... Just imagine, I'm about to have sex with my sister-in-law, whom I've been longing for! God, is this a dream? I carefully brought my head close to her vulva and gently licked her labia minora with the tip of my tongue. She let out a soft moan, then her body trembled a few times, spreading her thighs wider. Her labia minora slowly parted slightly, revealing pink labia. "This will actually increase the duration of intercourse," Xiao Fang said, rubbing her genitals with her other hand. My sister-in-law didn't say anything, quietly enjoying her brother-in-law's oral sex with her eyes half-closed. In a short while, he was already soaking wet. I thought it was about time to penetrate, but she sat up again, jumped off the operating table, and pushed my buttocks to the edge of the table so I could lie down. Then she said, "Every time I see my sister looking so good, I'm so envious. I think my brother-in-law must be very strong. Look how robust you are, while Xiao Tao is so thin. I originally thought that after we got married, I would urge him to exercise more, but it's no use. Brother-in-law!" "Your penis is so big! Xiao Tao's is only two-thirds the size of yours. I can't even swallow your little brother properly! Let me take a good look today." My sister-in-law said, taking my penis as far as she could into her mouth, while Xiao Fang could only rub my testicles from the side.

My sister-in-law, now an adult, rapidly licked the glans and lower part of my urethra with the tip of her tongue. I felt a tickling sensation and simply let them play with my penis. After a while, I noticed the licking method was different. I opened my eyes and saw that Xiao Fang was now licking my penis. Her tongue was very soft and warm, making me feel incredibly comfortable. Xiao Fang hadn't licked it a few times when my sister-in-law pushed her away. "I'm the one who needs to be fertilized! Why are you enjoying yourself here?" my sister-in-law began to scold Xiao Fang. Xiao Fang said, "Look at you, you stingy little devil! Do you think it's easy to see something this big? Besides, I'm just disinfecting it with my saliva, hehe." My sister-in-law told me to get up and said, "Brother-in-law, come in quickly! I'm so wet down there, it's unbearable! Hurry up and fuck me!" "Look at you, you little slut! How come I didn't notice when we were in school?" Xiao Fang said sourly from the side. With a soft "plop," my penis slid all the way into my sister-in-law's vagina. It was indeed very lubricated, and the back-and-forth thrusting felt so good! After a few thrusts, I suddenly realized that I hadn't seen my sister-in-law's breasts yet, so I said coldly, "This thrusting doesn't seem to be stimulating enough. I feel like a robot!" "Then how do you want stimulation? I've already let you penetrate me completely, what more do you want?"

my sister-in-law asked, puzzled. Xiao Fang quickly unbuttoned her top, removed her bra, and revealed a pair of large breasts. Her nipples were long and already erect. "Men also need visual stimulation during sex. This can help them improve the quality of their orgasm." Xiao Fang lectured my sister-in-law like a teacher, while rubbing her own breasts with one hand and my scrotum with the other. “I don’t need you to stimulate me, I have mine too.” My sister-in-law said, casually opening her surgical gown, revealing a pair of exquisite breasts to my eyes. Wow! The nipples were so pink, and I could even see the goosebumps. I quickly reached out and grabbed them, kneading them and pulling on her nipples with my fingers, occasionally licking them with my wet lips. My sister-in-law couldn’t help but moan, and Xiaofang quickly covered her mouth. “You’d better be quiet. You told me not to tell Xiaotao. If Xiaotao suspects something and rushes in, what will you do?!” My sister-in-law was so frightened that she quickly bit down on a corner of her unbuttoned surgical gown, frowning as she continued to receive my thrusts.

Strangely enough, perhaps because of Xiaofang’s encouragement, I lasted much longer today, thrusting for more than 20 minutes in 6 different positions before ejaculating. Although it wasn’t as long as some strongmen who could go at it for an hour or two, I was very satisfied with it, because my sister-in-law also excitedly reached orgasm several times. After I ejaculated, Xiaofang told me not to move, to keep my penis still to allow the semen to penetrate deeply into her uterus. My sister-in-law was exhausted, her eyes closed as if she had fainted. I could only continue to hold her waist and wait for enough time before pulling out. At this moment, Xiaofang brought her nipple to my mouth, indicating that I should lick it for her. About ten minutes later, just as Xiaofang saw my penis "heading up" again and was about to take off her pants, my brother-in-law called from outside the operating room: "Xiaofang, is it done? Why has the surgery taken so long?" My sister-in-law was startled awake, quickly sat up, and reluctantly kissed my once again erect penis. She quickly put on her surgical gown and lay down on the mobile stretcher she was supposed to lie on after surgery, ready to be wheeled out of the operating room. Xiaofang regretfully tidied her surgical gown and told her brother-in-law, "Almost done!"

For the next few months, my wife and brother-in-law seemed to deliberately keep us away, preventing me and my sister-in-law from meeting alone. However, her artificial insemination was successful, and she gave birth to a healthy and beautiful baby boy 10 months later. These past few days, she's been at her parents' house for postpartum confinement. Sometimes, when it's just the two of us alone in a room, she doesn't seem to care that my mother-in-law or wife might come in at any moment, and she deliberately exposes her breasts to breastfeed the baby. I know what this means, but I'm afraid that if I let it continue, my family will find out sooner or later, so I pretend not to understand. What should I do?

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I slept with my wife's younger sister, and my wife even thanked me.

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