Where it happened: Mother in laws house
Langauge: English
Sex: Male
Rating: 6
Category: Straight
I probably sound like a real asshole but this is how it happened.
I had been married for a couple of years but my wife hadn’t been very interested in sex around the time that it happened.
Because we both worked and I started early in the morning around 5am, I would go and have a swim at my in-laws pool after work if it was a hot day.
One day I was cooling off in the pool thinking no-one else was around when my teen aged sister in-law walked out wearing a bikini.
She had a swim with me and then we sat in the sun talking.
I couldn’t help noticing as we talked that her nipples were erect and as she sat cross legged in front of me I could see the crease between her legs.
Naturally I started to get an erection which I tried to hide by changing position.
Suddenly she said “Hey, I want to show you something” and she got up and went into the house. I followed her as she walked up to her bedroom.
Inside her room she started holding up a dress in front of her “what do you think, it’s my dress for the school dance”. I told her that it was very nice and she would probably be a hit with the guys because it was very low cut.
“you can’t tell until it’s on” she said and she started putting the dress on.
She looked so sexy that my cock started growing again.
then she really pushed me over the edge when she said “Oh no, my bikini is making my dress wet” then she reached up under her dress and slipped off her bikini bottoms. As she threw her bikini bottoms on the bed she looked me in the eye and said “Do you think I’m pretty?”.
I stopped thinking rationally and stepped towards her and whispered into her ear “You look fucking hot” then I kissed her.
Within minutes I had my fingers inside her cunt and she was responding by moaning and grabbing my cock.
Months without sex had made me feel very horny and although I tried to be gentle my cock just wanted to give her a good hard fuck.
Once I was inside her there was no turning back I thrust into her tight cunt until I was almost ready to cum then I pulled out, flipped her over and fucked her doggy style while I rubbed her clit. She started bucking and convulsing as she had a strong orgasm and when I felt myself cumming I pulled out and creamed all over her party dress.
I still feel really bad for cheating on my wife. It definately wasn’t a good idea and I don’t want todo it again even though when ever I see my sister in law I start getting a boner.
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