I gave my sister-in-law the vaccination.

I met my sister-in-law at my cousin's wedding. Because I was very busy with work, I knew nothing about his upcoming marriage until my parents notified me to attend. I saw her at the wedding; she was very beautiful, definitely above average, and her figure was accentuated by her wedding dress. I thought to myself, "My cousin is so lucky to have married such a beautiful wife; he's going to have a busy night."
After the wedding, I learned that my cousin's new home was in my neighborhood, which gave us more opportunities to interact. After a few visits, I learned that my sister-in-law wasn't from Shanghai. Our backgrounds were very similar; our fathers were both sent-down youth in Shanghai, and we both returned to Shanghai according to policy. Although we both have Shanghai residency, we both felt like we weren't truly Shanghainese, having experienced discrimination and unfair treatment there. Therefore, we had a lot in common. Later, we even discovered we were from the same city, which led to even more contact between us.
Gradually, I developed feelings for my sister-in-law. A few times I made advances towards her, and she acted naturally, showing no aversion. However, we both restrained ourselves, because we were relatives after all.
Usually, I was the one visiting her. If my cousin was home, I would say I was visiting relatives and bring them some things from work; if he wasn't, we would have heart-to-heart talks like lovers. We considered each other confidants, sharing our troubles at work and in life, and then helping each other find solutions or comfort. Once, during one of our conversations, she mentioned that my cousin seemed to have issues with sex, asking if he had any medical conditions. Since I had only been back in Shanghai for six years, I wasn't entirely sure.
A year or so passed, and my sister-in-law still hadn't gotten pregnant. My uncle's family was putting a lot of pressure on her. I knew they weren't using contraception, so I suspected one of them had a health problem!
During that time, my sister-in-law often argued with my uncle's family and was in a bad mood. She frequently came to me to confide in me, often crying. I urged my sister-in-law and cousin to get checked out. She said she would also have her husband go with her, but my cousin refused. Actually, after dealing with my uncle's family for several years, I knew they were all very concerned about saving face, sometimes doing things that were both laughable and pathetic. Finally, I secretly accompanied my sister-in-law to the hospital for a checkup, and the results showed she had no reproductive problems.
Afterwards, my sister-in-law cried for a long time. Between sobs, she told me about the inhumane treatment she had received from my uncle's family over the past few months. Because she hadn't gotten pregnant, my aunt had found some folk remedies that were nothing short of torture for her. Some involved inserting something into her vagina all night, causing excruciating pain and itching, tormenting her to the point of near death.
I could only comfort her, saying, "The problem has been found; it's not your fault. You can relax." She immediately retorted, "You know your uncle's family; do you think they'll admit it?" I thought so too; I wondered what they would do next.
My sister-in-law looked at me shyly and said, "How about I have a child for you? Anyway, you only have two grandsons, so having a child with your genes wouldn't be unfair to your family." I thought about it and it made sense. If my uncle's family knew their son couldn't have children, I don't know how they would treat my sister-in-law. Besides, I really liked my sister-in-law, so I agreed. We chose a time to have an affair.
One day, my sister-in-law lied to my cousin that she was going on a business trip and came to a hotel far from home with me. As soon as we entered the room, I couldn't help but hug my sister-in-law, and we started kissing. I took off her clothes, and she took off mine. I pushed my sister-in-law onto the bed, took off her pants and underwear, took out my already erect penis, and thrust it into her vagina. Her vagina was very wet; it seemed she couldn't wait either.
I began to slowly thrust in and out. My sister-in-law took off her bra, and I realized that her large breasts were real. I immediately bent down and buried my face in her breasts, pinching, squeezing, and scratching her nipples. Her breasts changed shape under my force. However, I had no intention of showing her any mercy. The force in my hands increased, as if I were treating her breasts like two rubber balls. Her pain could only be expressed by her indistinct cries: "Ah... ooh... ooh... ooh... ah... ooh..."
After a while, I released my hands and bit her now hardened left breast with my teeth, while my left hand continued to ravage her right breast. My sister-in-law trembled all over. While I was playing with her breasts, my penis didn't stop thrusting. My sister-in-law was trembling violently, so I immediately pressed my hands on the bed to support my body and increased the force of my thrusting. My sister-in-law orgasmed in just a few dozen seconds, and white mucus flowed from her vagina. It seems my sister-in-law is a slut; she came so easily.
I didn't pull out my penis, and continued thrusting, just not too hard. Then I lifted my sister-in-law's legs, raised her buttocks, and thrust deeply. My sister-in-law finally couldn't hold back and moaned, "So good... fuck... you're fucking me to death... ahh... ah... it hurts... please... no... don't go in so deep... ah..."
My sister-in-law was already incoherent, but I knew she was immersed in lust, so I started stimulating myself too. As I fucked her, I said, "Sister-in-law, you're so good! You're making me feel so good, I'm going to fuck you to death, you slut!" She cooperated with me, "Fuck me... fuck me... I'm a slut... ah... I'm your... ah... ah... slut... slut sister-in-law... ah..."
We both used heavy local accents when we said "sister-in-law," and this kind of uncle-sister-in-law affair gave us a great sense of pleasure and excitement. We fucked for a long time, and my sister-in-law was covered in sweat, her face had a lewd expression, and she kept moaning, her body moving in sync with my thrusts. She was indeed a beautiful young woman.
I felt myself about to ejaculate, so I increased the speed of my thrusts, each one reaching deep inside, driving my sister-in-law wild with pleasure. After a few minutes of intense thrusting, I finally ejaculated. This was the most satisfying sex I'd ever had. My sister-in-law lay weakly on the bed, while I still seemed to have energy.
I pulled out my penis, crawled to my sister-in-law's side, and rubbed it against her mouth with my hand. She knew what I meant, opened her mouth, and let me put my penis inside. Then she licked it with her tongue, licking up all the semen that had flowed from the glans.
I grabbed my sister-in-law's head and began thrusting my penis in and out of her mouth. She obediently accepted my oral sex and even used her hand to stroke my penis. I simply sat on the bed and made her kneel between my legs to give me oral sex. Watching her head bob up and down, and her big buttocks swaying, my lust was aroused again. I pushed my sister-in-law down and once again inserted my penis into her vagina, thrusting rapidly, making "plop, plop" sounds. My testicles hit my sister-in-law's perineum with a "slap, slap" sound. My coarse pubic hair rubbed against my sister-in-law's soft pubic hair, intertwining together.
My sister-in-law was, after all, a young woman with sexual experience. She shifted her hips, slightly bending her legs to spread her thighs wider, giving her vagina more space to avoid injury. I continued thrusting my penis, the glans like a high-powered piston going in and out of my sister-in-law's vagina.
More than ten minutes passed, and our breathing became more and more rapid. My penis rammed wildly inside her vagina, and my sister-in-law involuntarily twisted her waist, tightening her vaginal opening to meet my thrusts. Suddenly, my sister-in-law's legs abruptly wrapped around my lower body, her arms tightly gripping my back, her nails digging into my flesh, her whole body convulsing as she let out a mournful cry. I roared, and a stream of hot fluid shot into her uterus; we both reached orgasm simultaneously.
After ejaculating twice, I finally felt exhausted. Lying on the bed, I looked at my sister-in-law's vulva. The opening was wide open, a mess, my semen mixed with her bodily fluids flowing down. Her labia were swollen and red, a vibrant pink, making me feel intensely aroused and my heart pounding!
We rested for a long time before getting up to shower and then go out for some food. It was already 7 p.m. when we returned. I asked my sister-in-law if she had ever had anal sex. She said no, indicating that her cousin couldn't even take care of her vagina properly, let alone her anus. I said, "You've already given your virginity to my cousin, can you give me your first time with your anus?" She didn't speak for a long time, finally agreeing with a blush on her face.
I first gave my sister-in-law an enema, then used shampoo as lubricant to perform anal sex with my fingers. I inserted one finger first, and when she said it didn't hurt anymore, I added another, until finally all four fingers were moving back and forth inside her anus. When I pulled my fingers out, her anus was now a large hole. I immediately poured some more shampoo in and inserted my penis. As soon as it went in, I felt a very strong squeezing sensation.
I was so excited to experience anal sex for the first time, and I started thrusting vigorously. My lower body collided with her big buttocks, making a "slap slap" sound. My sister-in-law screamed with pleasure, occasionally scratching her vagina with her fingers. I ejaculated inside her anus after more than thirty minutes.
My sister-in-law and I spent three happy days in the hotel, trying every sexual position and method we could think of. My sister-in-law even developed a liking for anal sex, and I also developed a liking for sucking her breasts.
After that, we made love whenever we had the chance. Six months later, my sister-in-law finally got pregnant. The hospital checkup showed she was three months along. When we got home, we even tried to figure out when she conceived. We figured it was either the time in the elevator on the roof of my workplace, or the time we had sex in the deep forest in the park.
My sister-in-law eventually gave birth to a son, and my husband's family's attitude towards her changed drastically; they adored her. I thought our affair should end, but my sister-in-law seemed unable to live without me. Six months after giving birth, she took the initiative to have sex with me again. I also loved my sister-in-law very much, so we continued.
Later, I got married, and my sister-in-law was very unhappy. She ignored me for half a month, but she still attended my wedding. On the wedding night, after all the guests had left, she didn't leave because my wife was drunk and completely intoxicated. My sister-in-law first had sex with my dazed wife, and then we had sex all night with her until 5 a.m. before she finally left.
My sister-in-law told me before she left that she had drugged my wife's drink, which was why my wife was "drunk" like that. As a result, my sister-in-law and I were the main characters on our wedding night. We continued this sexual relationship after the marriage, and even later when I went to play wife-swapping games, I took my sister-in-law with me.

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I gave my sister-in-law the vaccination.

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