The Origin of Cuckoldry: Sister-in-law Gets IUD Before Marriage

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Ever since my wife suggested that the three of them could have sex together, my wife, my brother-in-law, and my sister have been acting like a couple with multiple wives. My wife herself has even taken to the role, genuinely feeling like she's my brother-in-law's mistress. They eat together, shower together, and sleep together. However, they're all very careful to maintain a proper balance. They've read online that pregnant women in their late stages shouldn't have too much sexual stimulation, as it could easily trigger contractions. So

, with this concern, usually it's just my wife and brother-in-law occasionally giving my sister some gentle caresses. My sister says this is much better than before, when her husband and sister would make love in the room while she eavesdropped outside. She feels a real sense of participation, and this makes her relationship with her husband better and more transparent. During that time, my sister's complexion was excellent, and her mood was much better. A few days later, they visited my uncle's house. Even my aunt, seeing my wife's sister, remarked on how well her niece looked, indicating she was being well cared for, and predicted her baby would be very healthy.

At night, the three of us sleep together in the master bedroom. We don't have sex every day; sometimes it's just mutual caressing and playing around for a while before my wife goes back to the small bedroom to sleep. Occasionally, my brother-in-law will sneak into the small bedroom in the middle of the night to have sex with my wife. Since my brother-in-law's birthday, he's always had unprotected sex with my sister-in-law, ejaculating inside her; everyone's gotten used to it.

One night at dinner, I think my sister asked my brother-in-law at the table if he always ejaculates inside when he's having sex with Xiaohui (my sister-in-law), since the safe period isn't that long. My wife was terrified and hurriedly asked my sister, "What should we do? Could she be pregnant? My parents will kill me!" My sister said, "Don't worry, you two have sex almost every day, the sperm probably isn't fully mature before ejaculation, so she shouldn't be pregnant." Then she told my brother-in-law to quickly buy some emergency contraception (毓婷) and two boxes of condoms, and to use condoms from now on.

My brother-in-law rushed out, and my sister asked my wife if she and Ali always used condoms. My wife honestly admitted that she was taking long-acting birth control pills, the kind that take one pill a day. Her sister-in-law scolded her, saying, "How could you be so foolish? How could a young woman like you take that kind of pill for so long? If you take it for a long time, it'll be hard for you to conceive after you get married." My wife was a little worried and asked her sister, "She's been taking it for over half a year, will it have any effects?"

Her sister-in-law said, "It should be fine. Taking those pills for a long time, even for several years, will definitely have an effect. In your case, it should be fine. Just use condoms from now on! You did all this to help me, I'm so sorry you had to go through all that trouble." My wife said, "It was all my own choice. Actually, my brother-in-law had quite a good time with me, and I feel like I can finally let go of my feelings for Ali." Her sister-in-law said, "That's good, as long as you don't feel wronged." My wife said, "I really don't feel wronged, and my brother-in-law is really good to me."

Just then, her brother-in-law came in with some groceries and, picking up where my wife left off, said, "Of course, absolutely!" "First my sister-in-law, now my concubine, I have to treat her well!" He then gave my wife a heavy kiss on the cheek.

My sister-in-law said, "Take the emergency contraceptive first, and if we're going to have sex tonight, make sure you wear a condom!" That night, my brother-in-law wore a condom and had sex with my wife. My wife said that since losing her virginity to her first love, this was the first time she'd experienced sex with a condom, and it felt absolutely terrible, extremely uncomfortable. It was very uncomfortable from the moment my brother-in-law started penetrating her, and if it lasted a little longer, her vagina even felt a burning pain. My brother-in-law also said it didn't feel good. Later, on the third or fourth day of having sex with my brother-in-law while wearing a condom, my wife said she felt some pain down there. Later, my brother-in-law carefully examined my wife's labia minora and found two small blisters on the edge of her labia minora. Since

my wife had this problem, we temporarily stopped. If my brother-in-law really wanted it, my wife would let him use anal sex to help him release his pent-up desire. My brother-in-law said it might be because my sister-in-law's vagina is too delicate, and the condom chafed it. My wife also searched online for the possible causes. Some said it was an allergic reaction to condoms, others said it was caused by the lack of water, but my wife didn't get a definite answer. She spent a lot of time chatting with her classmates those two days, and she asked them if they had heard of anyone getting blisters from using condoms during sex. Her classmate immediately said, "It must be with your brother-in-law, right? I told you you'd eventually fall into his clutches." My wife said, "What nonsense are you talking about? My sister-in-law is great, and I did it willingly."

Her classmate, naturally, liked to pry, and my wife figured since she already knew, there was no point in hiding it. So she told her classmate everything: celebrating her brother-in-law's birthday, and since she happened to be in her safe period, he ejaculated inside her… After all, she was her best friend, and she wouldn't betray her. Her classmate said, "You get along so well with your brother-in-law and sister. If you want to maintain this relationship until your sister's postpartum period, there's actually another way if you can't use condoms."

My wife asked what the solution was. My classmate said, "Since you've told me such a private thing, I'll also tell you my own secret." My wife seemed to have discovered something amazing and urged her classmate to tell me quickly. The classmate said, "Remember to keep it a secret!" My wife, of course, promised repeatedly. The classmate said that she was actually in the south, in Guangzhou, being kept by a Hong Kong businessman. The businessman seemed to be almost fifty years old. He met such a young and beautiful girl, and since he was paying her to be his mistress, he naturally didn't like using condoms, so he took her to the hospital to get an IUD.

When my wife heard this secret, she was surprised, but she also understood that she could also get an IUD to solve her current problem. The classmate said, "In today's society, it's normal to have a few relationships and be slept with a few boyfriends before marriage. Basically, once you establish a boyfriend-girlfriend relationship, the next step is to sleep with them. Before meeting your true love, no matter how many boyfriends you have, you're just being taken advantage of. So it's better to take advantage of your youth and good looks to make money for a few years, so you won't have to worry about a house and a car when you want to get married."

My wife said she was actually convinced by her classmate's and best friend's theory. A few days later, her brother-in-law would check on her almost every night. When he found the blisters on her vulva had finally disappeared, my wife suggested taking a morning-after pill (emergency contraceptive) afterward. So she let him have sex with her again, without a condom, and then she took the pill. Seeing the blisters had subsided, my wife went to the hospital to inquire about IUD insertion during her rest period. The doctor said that normally, it should be done after menstruation, but if she was in a hurry, and since she was young and seemed healthy, she could have it done now if she wasn't menstruating. After insertion, intercourse should only resume after her next period.

My wife, I don't know where she got the courage, didn't even go home to discuss it with her sister, and went to the hospital to get an IUD inserted. A 19-year-old girl, not married, and without a boyfriend, got an IUD inserted—how outrageous is that? I still can't understand what my wife was thinking when she made that decision. My wife said that when she was getting her IUD inserted, something was inserted into her vagina, and it felt like it was stretching open inside, causing a lot of pain.

After resting at the hospital for a while, she only had slight lower abdominal pain after returning home. That night, her brother-in-law wanted to have sex with her. After my wife gave him oral sex and he got an erection, he tried to have sex with her vagina, but she refused and gave him oral sex instead. She told him that she hadn't let him have sex with her vagina recently. Her brother-in-law asked if she was worried about the effects of taking too much birth control pills. He said that if that was the case, he wouldn't have sex with her anymore, only once every two or three days after her period ended. My wife thought about it and told him that she had gotten her IUD inserted that day, and that she could have sex with him without a condom again after her next period.

When her brother-in-law heard this, he was both happy and touched. My sister, who was listening nearby, was shocked and said that my wife was making herself suffer like that, saying it was unnecessary. My wife said she found many young women getting IUDs online. She heard some were kept by wealthy men, some had boyfriends who didn't like using condoms, and others were newly married and not planning to have children yet. She told my sister and brother-in-law not to worry about it. Since my brother-in-law has already called her his mistress, she just wants to fulfill her duties as a mistress and hopes he can understand her good intentions and continue to treat my sister well.

My wife's sister said to her husband, "See? Xiaohui has done all this for you!" The brother-in-law replied, "Xiaohui is the best sister-in-law in the world. I will cherish her and love her dearly. I will never let you two sisters down." After that, the brother-in-law did indeed behave better than before, eagerly doing all the housework. Every night, he would carefully lick my wife's tender vulva.

After a while, my wife finally got her period, and all three of us breathed a sigh of relief. After her period ended, my wife said it was okay, but for the first two days, the brother-in-law only penetrated my wife's anus. He endured for two more days before starting to penetrate my wife's vagina. When he penetrated her, he exclaimed, "This is the most comfortable way to penetrate! This is how penetration should be done!" My wife's sister, who was listening nearby, couldn't stand it anymore and said to her husband, "You should really thank our Xiaohui. Think about how much she has sacrificed!"

The brother-in-law repeatedly said yes, "I must thank my little wife and sister-in-law properly. Look, I'm thanking her right now!" I'll make my little wife orgasm twice in a few days, that's the best way to thank her. Little wife, sister-in-law, don't you think what your brother-in-law said is right? My wife said, "Hmm." Then let's see what you

're capable of, brother-in-law! While my brother-in-law was having sex with my wife, my wife wanted to lick her sister's pussy, but her sister wouldn't let her. She insisted on giving my wife a blowjob and licking my wife's neck. I don't know how her sister knew that my wife's neck was the most sensitive spot. With her tender pussy being thrust into by my brother-in-law and her most sensitive spot being continuously stimulated by her sister, my wife quickly came to orgasm. My wife said it was the fastest orgasm she'd ever had since she started having sex. Then, after a short break, my brother-in-law continued thrusting. My wife wanted to lick her sister's pussy, but her sister wouldn't let her. Instead, her sister licked my wife's ears. My wife said she didn't even know her ears were so sensitive.

My wife said it might be because of her mindset. It's because she's only 19 years old, has an IUD, and has given her young body to her brother-in-law without reservation, letting him do whatever he wants in front of her sister. Then my wife had a second orgasm. During the second orgasm, my brother-in-law said that it felt like there was a strong suction force inside my wife's vagina, as if the entire vagina was tightly gripping his penis, and the depths of her vagina were also sucking on his penis. So my brother-in-law couldn't hold back and reached orgasm at the same time as my wife. After my wife had the IUD inserted, he ejaculated his first load of semen into my wife's tender vagina.

When my brother-in-law's penis softened inside her tender vagina and slid out, my wife wanted to lick his penis, but my sister beat her to it. My sister opened her mouth and took my brother-in-law's penis in, sucking on it with relish. My wife could only lick his testicles. My brother-in-law said, "You two sisters are both little vixens, they're too tempting."

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The Origin of Cuckoldry: Sister-in-law Gets IUD Before Marriage

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