In the short story, 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 am 33 years old this year.
By the end of the year, we will have been married for exactly 10 years. My wife is the same age as me, and our child has 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 we've always gotten along well. However, what happened during her artificial insemination a while ago is still fresh in my memory! My wife's younger sister, Miroa, got married when she was 23, but even after 3 years of marriage, she still hadn't gotten pregnant. Her parents were very anxious, and my wife even asked me to bring back some special medicine when I went abroad, but none of them worked.
Later, I asked my wife to secretly ask her younger sister if her brother-in-law had some kind of problem with his sexual function.
To be honest, I had my own reasons for asking her this question: objectively speaking, my sister-in-law is not as pretty as my wife, but she is 6 years younger than us, very youthful, and she has a very fit figure, which makes people think that the skin would feel very tight when touched.
If my brother-in-law has a problem with that function, wouldn't that give me a great chance? My sister-in-law and brother-in-law are the type to have a whirlwind marriage; they only started dating a few months before the wedding.
So before she had a boyfriend, she often came to our house to play. Especially in the summer, she was very casual at her sister's house, running around in my wife's nightgown without a bra, which always made my little brother feel secretly uncomfortable. Also, when we first renovated, we had nails hammered into the wooden door of our bathroom because we hung a decorative thermometer there. Later, we took the thermometer down, but the nails left a small hole that allowed us to see into the bathroom. Before my wife noticed, I quickly put up a picture of her favorite celebrity.
This little hole was once my source of pleasure when I spied on my sister-in-law taking a bath. At that time, my sister-in-law had the body of a young girl. Her breasts were not big, but her nipples were large, round, and perky. Her pubic hair was very thick, in the shape of a trimmed Arabic numeral "1".
Because the hole was too small and too high up, I never clearly saw what was underneath it.
Such thrilling voyeurism ceased after her marriage... I once wondered if my sister-in-law might have feelings for me, since we often met while living in a large family and I was probably the first young man she encountered most often when she was still naive. But an incident later made me put that idea on hold: Once, she and her brother-in-law came to my house. I had just gotten home and went into my bedroom to change into my pajamas. I had just 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 couldn't help but
exclaim, "Ah!" I said awkwardly, "It's okay, I'm not completely naked."
She dismissively said, "Hmph! Who cares!" and went out.
In addition, in the summer, when Miroa wears low-cut clothes, whenever she bends over in front of me, she will naturally cover her chest with her hands, as if afraid that her brother-in-law will see it, just like the subconscious actions of those strange women I see outside.
From then on, I concluded that she only saw me as an older brother, and I never had any further expectations.
Later, one weekend, my wife came back from her younger sister's house. Afraid that the children would hear, she secretly pulled me into the nanny's room and told me that she had asked her younger sister and heard that although her brother-in-law was not very strong, he was a normal man who could have sex with his wife. Moreover, her younger sister had also been to the hospital and her physical functions were fine. She did not have any problems such as blocked fallopian tubes or uterine adhesions.
My wife told me to think of a solution, otherwise her parents would be too worried.
I was ordered to inquire around, and later I heard from a friend who worked at a hospital that although men can get an erection and ejaculate without any problems, they cannot conceive if the semen concentration is insufficient or if there are no live sperm in the ejaculated semen.
I told my wife the news, and a few days later she told me that her sister-in-law had forced her brother-in-law to get checked, and it turned out he really had azoospermia! The young couple were going to try artificial insemination.
But my wife said she had an embarrassing request for me to agree to: she hoped I could donate my sperm. Her sister-in-law felt that although the sperm provided by the hospital was supposedly donated by healthy men with a bachelor's degree or above, Miroa was worried that if the man was too ugly, it would harm the next generation.
Besides, my brother-in-law is so handsome, and his child with my sister is so beautiful and smart. She thinks that if my sperm is used, the child will definitely have good genes, and the child will also have a real family relationship with this family in the future. She just doesn't want her parents to know, because she's afraid they won't be able to accept it due to their traditional thinking.
I said, "Wife, if you have no objections, of course I have no objections, haha, I have another child!" My wife said, "You wish! You absolutely mustn't tell the child this in the future. Firstly, it's to protect the child's feelings, and secondly, it's a condition your sister-in-law agreed to." The next morning, my sister-in-law 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 have the sperm collected? I can go today," I replied.
"It's in Xiaofang's department." "Ah, Xiaofang?" I really didn't expect to hear the name Xiaofang.
Because Xiaofang was Miroa's classmate and worked in the obstetrics and gynecology department of a large hospital in our city, and because we had previously asked her husband to help us buy cell phones and had dinner together.
"But why would collecting sperm 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've chosen someone close to me to donate sperm, we shouldn't use frozen semen like usual, because that would cause some sperm to die and affect the conception rate... You see, I'm embarrassed to say this..." Miroa stammered as she explained.
"Okay, fine, no problem." I thought to myself, it doesn't matter, I won't get any advantage over my sister-in-law no matter how I collect the sperm, it's just that the sperm is missing the step of being flash-frozen with liquid nitrogen.
"Then please don't drink or smoke these days, okay? Just think of it as doing this for your future nephew, brother-in-law!" The sister-in-law seemed much more relaxed.
"No alcohol is no problem, but I'll really have to work hard to quit smoking." I thought to myself, he's not some nephew, he's clearly doing this for my "son".
"Thank you, brother-in-law. Then let's go to Xiaofang's place together in two weeks." After hanging up the phone, I subconsciously put out the cigarette that was half-smoked.
A week later, my wife was away on a business trip, so it was just my sister-in-law and her husband who went to the hospital.
Upon entering the hospital, Xiaofang blocked her brother-in-law outside the obstetrics and gynecology operating room. Then, her sister-in-law went into the operating room to prepare, while I was led to an instrument room attached to the operating room.
Xiaofang told me that this place is not like the sperm collection room in the andrology department of a hospital. There are no stimulating videos to watch. You have to figure out how to get the semen out yourself and put it into a glass container she gave you.
Xiao Fang went out, and I noticed it was getting a bit hot here, so I took off my pants completely, took out my precious little thing, and told it, "You'd better do your job today and give me some high-quality seeds."
Then I slowly started to manipulate it with my hands.
Although the thought that his sister-in-law was right next door, and that her little brother might be naked underneath, immediately made him stand up proudly, it
was really boring to be alone here. He had been masturbating for 10 minutes and still showed no sign of coming.
"Squeak!" The door suddenly opened, and Xiao Fang quickly slipped in. I was still stroking my penis. I was too scared to do anything about it. I had never contacted her before. I never expected that my little brother would be so firmly held in her hands today... My little brother was jumping up and down uncontrollably.
"Brother Kang, I never expected your penis to be so big, it's really rare! But your foreskin seems a little long." Xiao Fang stroked my penis back and forth with her hand while looking at me with a strangely tender gaze.
「没关系吧，只有在它疲软时才看得出来包皮有些长，你看勃起后包皮都褪到后边了，不会影响性生活质量的吧？」说实在的我过去没把这当问题。
「谁说没关系，包皮稍长一点也会藏污纳垢的，另外由于平时有包皮的包裹，勃起时突然露出来的龟头会因爲突然暴露在外接受不了太强的刺激而坚持不了多长的时间。」在说这话时小芳很专业。
「哦，不瞒你说，我自己自卑的一点就是这，虽然阴茎比一般人都大，但我一般插进去超不过１０分钟就射了，原来原因在这儿啊。」「这没什么，回头你来，我都可以帮你做个包皮环切术，那只是个小手术。
」小芳说完，认真地用脱脂棉球蘸了些生理盐水帮我擦拭龟头附近的冠状沟，她的脸离我的小弟弟越来越近，眼看小芳的嘴巴就要亲到我的弟弟了，门又一次「吱」的响了，小姨子ｍｉｒｏａ猝不及防的走了进来。
「小芳你在干什么？」小姨子似乎有点不高兴地问。
小芳下意识已经用双手摀住了我的阴茎，但他的手太纤细，只够摀住我的阴茎本身，整个阴囊却完全暴露在外，小姨子正在目不转睛地盯着它看，完全不像上次看到我换衣服那种不在乎的神情。
这倒把我弄得很不自然，随便抓着揉成一团的裤子盖在光秃秃的腿上。
「哦，这里条件太不专业，康哥的精子射不出，我准备用直肠内刺激前列腺的办法帮康哥射精。」小芳的反应很快，她的镇静倒显出我的仓皇。
「小芳，我想问你，你一会儿用什么东西把姐夫的精液放到我身体里？」小姨子似乎对手术过程不是很放心，但眼睛还是恶狠狠地盯着小芳盖在我阴茎上的双手。
「我们有专门的送精器，你放心，我们一年做上百例人工受精呢，经验和消毒没问题。」小芳依然蹲着没起来。
「那器具是什么做的，冰冷吗？」ｍｉｒｏａ也蹲在了小芳旁边，由于她穿了件手术袍，胸口开得较大，我清楚看到她的乳沟很深很深，小弟弟又不听话地跳起来，一下子从小芳的两手间蹦了出来，小芳赶快又用手摀住。
「恩是合金的，但我可以帮你把它加温一下，不会太冰。」「小芳，我有个事求你，我不想要那金属玩意儿插进我身体，我想要个儿子，听说女人到高潮的时候授精生儿子的几率大，就让姐夫直接帮我送进体内吧，但你不要告诉小涛（我妹夫的名字）好吗？姐夫，求你了，就当爲了你外甥嘛！
」小姨子撒起娇来，她的右手也很快摸到了我的阴囊，用手指轻轻的揉起我的蛋蛋来。
「我们可是兄妹关系啊，这么做将来咱们见面多尴尬？」虽然我心里一万个愿意，但我还是违心地说了这么一句。
「这是特殊事件特殊处理，你不说，我不说，小芳不说，我姐也不会知道的嘛！姐夫！」小姨子的右手已经顶开了小芳的双手，握紧了我的阴茎。
我的弟弟已经情不自禁地连续震动几下。
「那好吧，但我们要到手术床去，这里卫生条件不具备！」小芳说完又从小姨子手里把我的阴茎夺了回来。
我赶快找了个台阶下，迅速站起来，说是这里太热了，顺便把上衣也脱掉，裸着身子出门走进手术间。
小姨子飞快地跟了出来，往床上一躺，叉开双腿把两条白白嫩嫩的玉腿放在了産床的支腿架上，这时，她的整个阴户实实在在地暴露在我眼前，虽然原来偷窥过她的阴毛，但大阴唇和小阴唇还是第一次看到，而且这么近。
当时如果能测血压的话，我的血压绝对在１８０以上。
你想想，我垂涎已久的小姨子我马上就可以和她交媾了，天啊，这是在做梦吗？我小心翼翼地把头凑到小姨子阴户前，用舌尖轻轻地舔了舔小姨子的小阴唇，她哼了一声，然后身子紧跟着震颤了几下，把大腿根敞得更开，小阴唇慢慢地裂开一个小缝，粉红色的阴唇。
「******里负担，反而会增加性交时间。」小芳说着，用另一个手揉着自己的阴部位置。
小姨子倒没说什么，眯着眼睛静静地享受着姐夫给她口交，一会儿功夫，他的底下已经湿透了，我看差不多了，应该可以插了，但她又坐起来，从手术床上跳了下来，把我的屁股推到手术床边让我躺下来。
然后说：「每次看到姐姐的脸色那么好，我都好羡慕，我想着姐夫就应该很厉害，你看你这么健壮，小涛却那么瘦，我原来以爲结了婚我催他好好锻炼会好呢，结果没戏。姐夫！你的阴茎好大啊，小涛只有你的三分之二，你的弟弟我都咽不到底！今天让我好好看看。」小姨子说着，就把我的阴茎尽可能地含到嘴里，小芳只能在旁边揉着我的卵蛋。
小姨子用舌尖频率很快地舔着我的龟头尿道口下部，我感到一阵搔痒，干脆任由她俩玩弄我的阴茎。
过了一会我感觉舔法怎么不同了，睁眼一看原来，现在舔阴茎的人换了小芳，她的舌头非常柔软，很温热，让我感觉特别的舒服。
小芳没舔几下，小姨子就把她推开。
「是我要受精啊，你怎么在这儿享受呢？」小姨子开始责怪小芳。
小芳说，「看你个小气鬼，这么大的家伙容易见到吗？再说，我也用口水帮你消消毒啊，呵呵。」小姨子让我起来，说：「姐夫，快进来吧，我底下湿得受不了了，难受死了，快干我吧！」「看你个小淫虫，原来上学怎么没发现呢？」小芳在一旁酸酸地说。
噗呲一声，我的阴茎整个挺进了小姨子的阴道，的确润滑透了，来回抽动好享受啊！抽动了几下，我突然想到都这么半天了我还没看到小姨子的乳房呢，就冷冷地说了句，「这么抽动好像还是不够刺激啊，感觉自己想个机器人！」「那你要怎么个刺激法，我整个人都让你插了，你还要怎样？」小姨子不解地问，而小芳则快速把自己上衣纽扣揭开，去了胸罩露出了很大的一对奶子，她的奶头很长，已经硬挺挺地立在那里。
「男人作爱也需要视觉的刺激，这样可以帮助他提升高潮质量。」小芳像个老师在给小姨子讲课，同时用一只手揉着自己的肥奶，另一只手则在揉着我的阴囊。
「不用你来刺激，我也有。」小姨子说着干脆敞开了自己的手术袍，一对精致的乳房耀进我的眼帘，哇！
乳头这么粉红，而且鸡皮疙瘩都能看清楚，我迅速把一双手送上去抓揉起来，并不断用指间提拉她的乳头，间或用嘴巴湿湿地舔一下。
小姨子情不自禁地浪叫起来，小芳赶快摀住她的嘴巴。
「你最好安静点儿，你还让我不要给小涛说，你这样叫小涛要是怀疑了沖进来看你们怎么收场！！！」小姨子吓得赶快用牙咬住解开的手术袍一角，皱着眉头继续迎接着我的抽送。
说来也怪，或许是小芳的开导，我今天持续时间长多了，换了６个姿势抽送了２０多分钟才射了精，虽然不及某些勐人动不动就大干一两个小时，但对我来说很满足了，因爲小姨子也很兴奋地达到高潮好几次。
射了精，小芳让我来别动，把阴茎还放在里边不要出来，这样能让精液很深入的送入她的子宫。
小姨子已经没了力气，闭着眼睛像昏了过去，我只能继续抱着她的腰等待时间足够再拔出。
这时小芳把她的乳头凑到我嘴边，示意我帮她舔舔。
有十分钟的样子，正当小芳看到我的弟弟又擡起了「头」，准备脱下她的裤子时，妹夫在手术室外边喊：「小芳，好了吗？手术怎么做了这么久了？」小姨子一下子吓醒，赶快坐起来，依依不舍地亲了亲我的又一次勃起的阴茎，赶快穿上了手术袍躺在了手术后应该躺的移动担架上准备被推出手术室。
而小芳则遗憾的整理了手术消毒服，给妹夫应了声：「马上结束！」之后几个月，我老婆和妹夫似乎故意让我们避开，没让我和小姨子单独见过面，但小姨子的人工授精很成功，１０个月后生下了一个健康漂亮的男婴。
这几天，她做月子回娘家了，有时只有我俩单独在一间屋子的时候，她竟不怕岳母或我老婆随时会进来，故意敞着一对奶子给孩子喂奶，我知道这意味着什么，但怕任其发展迟早总会让家人发现的，便总当没领悟。
大家你们说怎么办啊？
【完】
I sincerely thank the original poster for their hard work and selfless sharing.
Thank you so much for sharing!
Good posts deserve a reply and support.
Thinking things through well
depends on everyone.
I think the original poster is absolutely right.
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