Unknowingly penetrated my girlfriend’s sister!

Hi people, this is a true story that I have only shared with one other person and now you. I am 30, my wife is 30. We were schoolmates and dated for a couple of years and have been married for a year now.
My wife and I have a very high libido. During our dating, we would have a lot of dirty and experimental sex. I had to force it out of my wife to accept and own being a journey person. She had told me stories about all her past sexual encounters and I realized a pattern where she was just using them to satisfy herself. She was from a conservative family and apart from her younger sister, no one knows how horny she is. My wife shares all her experiences with her sister in detail.
My wife is 5’4″, 32-25-34, fair, slim, and hot as fuck. I know she is not busty, but I love her.
On this one occasion before we got married, I was visiting Delhi and decided to stay at my girlfriend’s (my future wife’s) place as her parents were out of town. So I went to her place and the moment, I reached we fucked within 30 seconds and I filled her pussy.
My girlfriend loves being fucked raw. She may not accept it, but she has had sex only raw in the past. She tries to show she is not, but, over time I found out she is too thirsty.
So, that evening my girlfriend’s sister (my soon-to-be sister-in-law) came home with her boyfriend and we decided to drink.
We were cut chatting and were about 4 pegs down and pretty tipsy to the point where my wife was sitting in such a manner that I could see her bare pussy. She was wearing a long t-shirt without a bra or panty. Her younger sister was wearing a thin dress with just the panty and no bra.
The night went on and while chit-chatting, my wife was fiddling with my dick and talking to the sister’s boyfriend. We were under a blanket. I was kneading her boobs slowly.
It was about 1:30 am and we were pretty drunk by then and my wife pretended to want to sleep. But she wanted to use my tongue and cock to satisfy her pussy and sleep. Now the sister and the boyfriend went to the other room and we did it for about 30 minutes and slept.
Suddenly, we woke up hearing a loud cry and saw it was her sister. She was just in her bra and abusing her boyfriend. And we didn’t know what gibberish she was speaking, but all we understood was his hands were bleeding.
My wife ran to the other room and my GF’s sister came and hugged me. To my surprise being drunk, I was only in my vest and my cock was touching my soon-to-be sister-in-law’s clit and it started to grow. I tried to withdraw from the hug, but she adjusted her thighs and gripped my cock between them and pulled me closer.
My tool was about 5’5″ and thick. Now when I say thick, I mean the one that make you scream, “THICK!”
I could feel her squeezing my cock with her thighs trying to milk it. She suddenly shoved her tongue in my mouth and I got the most concentrated smell of alcohol I had ever got from someone’s mouth.
I pushed her away and asked if she had drunk more. Then in mumbled voice, she said that she and her boyfriend had one more whole bottle of Magic Moments vodka.
I lay her on the bed in our room and covered her and put on my shorts and went to the other room where I saw the mirror broken and the boyfriend’s hand was bleeding and my wife was trying to wrap the wound.
I took him to the bathroom, took his hand, checked for glass, and asked him to leave. After he left, I closed the gate. My wife was picking up the glass and I told her I would do the sweeping and swabbing. Then I checked on my sister-in-law in our room and took a broom and dustpan to pick up the smaller pieces of glass.
I asked my wife to go to bed and while going, she told me that her sister and her boyfriend had an argument and were slammed. And that she was drunk and would tell me in the morning in detail. Then she went to bed and I cleaned up the place.
It took me about 25 minutes to clean up and when I was done, I went to our room to sleep and saw my wife and my sister-in-law sleeping on either side of the bed. I pushed my wife in the middle and I was on her right. I spooned her and she pushed back and I put my cock in her and slept.
Then I suddenly realized that someone was sucking me and I remembered being inside my wife and not moving. Thinking it was my wife, I let her continue. After some time, she took it out and pushed her butt into my cock to finally insert it in her pussy. I started slowly moving back and forth. I put my head up to see if her sister was there and didn’t notice her.
Thinking the my girlfriend’s sister was in the loo, I started looking at the door and fucked my wife harder and just covered her mouth. I fucked her like that for about 20 minutes, till she started squeezing my cock hard and orgasmed and just let her body become lifeless.
As I wasn’t finished, I quickly pulled her to my cock and made her suck me. Then I suddenly went to grab her boobs and realized they were much bigger and bouncy and realized that it was my sister-in-law’s! God alone knows what happened!
When that realization happened, I unloaded every drop of everything I had in her mouth and she swallowed it. The rest I wiped off with the sheet she was covered with and went back to sleep.
I got up late the next morning and saw no one sleeping there. I went to the other room to walk in on a conversation where my sister-in-law said she didn’t remember much. But she knew she had sex with her boyfriend while she was sleeping. She didn’t remember the fight.
My wife told her sister that she had a fight with her boyfriend. And because he didn’t have condoms, her sister had fought with him and he broke the mirror and left.
I also got to know that my wife was feeling like vomiting. And because she was sleeping in the middle, not disturbing me and her sister she went and slept in the other room barely after I had put my cock into her and fallen off to sleep.
It seemed like no one remembered anything, or they do they but don’t want to say it.

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