Wife's Sister Is Secretly Desired!

My wife and I have been married for 14 years now. We are in our late 40's and my wife's sister is in her early 40's. My wife is absolutely beautiful, light brown hair and brown eyes, a slim body with nice breasts. Her sister has more of a lithe dancer's body with a nice firm ass.

When my wife and I first started dating, she was so excited to introduce me to her family. Her sister was maybe in her early 20's at the time, and she was pleasant and welcoming. There was absolutely no attraction whatsoever at the time.

After my wife and I were married, I got to know my sister-in-law a bit better. I realized that she has a kind heart, but with me she could be cold, a bit snooty. I went through a period where I hated to be around her. One day, though, she leaned across me to talk to my wife. We were at a play and they were talking in a hushed manner. She rested her elbow way up high on my inner thigh as her and my wife chatted. I felt her elbow subtly shift, as though she was trying to feel for my cock, or maybe perhaps tease me. I looked very subtly at my wife to see if she noticed anything, but it was dark in the theater. I could feel myself starting to get uncomfortably hard, and then my SIL moved her elbow up a bit further. Feeling my cock, she began to press a bit firmer. I pretended as if it was nothing but my heart was pounding madly. Done chatting, she sat back up straight, as if nothing had occurred.

A few months later we were at a family gathering and I felt a body rub against mine. A soft rub of her hip against mine, and a breast against my shoulder. Thinking it was my wife, I looked over my shoulder, but it was my SIL! I looked around nervously, but no one else was in the kitchen. She had plenty of room to navigate around me, but she chose to rub against me...why? I was a bit suspicious but managed to push it out of my mind.

Over time, I noticed she would rub against me, and it was always when no one was around. Was I losing my mind? Was this intentional or was I over extending my naughty imagination? She was still snooty at times so it left me confused. My thoughts began to obsess over her. She has beautiful dark brown hair, expressive eyes, full lips, and mmm that ass. I'd imagine her full lips sucking on my cock, or my cock plunging into her pussy as I stared down at her ass.

One time they were over our house and at one point it was just her and I in the jacuzzi. Her husband and my wife had gone into the house to fix some more drinks. My SIL, seeing that her drink was out of reach, stood up, lay flat on her belly and extended her arm to reach for the drink. Her legs were slightly spread. I was directly across from her, and our jacuzzi is small. She knew what she was doing! Her ass was only a few feet away from me and she was wearing a white bikini. Her bikini cupped her round asscheeks, and I followed the bikini line down between her legs. I could see the outline of her pussy lips against the wet fabric, and then I noticed a few tufts of pubic hair poking out of the edge of her bikini. I was hard again...thank goodness for the jacuzzi bubbles! This was a matter of only a few seconds but I took full advantage of it. She looked over her shoulder quickly, as if trying to catch me. I think I looked away in time? I don't know, but it was then I began to realize that maybe she was getting off on teasing me.

I started looking forward to us hanging out. When she would walk by, the fresh smell of her hair, her skin. It was intoxicating. She dresses very well, if conservative, and I always looked forward to seeing what she would wear.

There are so many instances that I can talk about where she teased me and it drives me insane. I know that nothing will ever come of it, but I've realized that if a woman can master the art of the tease, then a man is putty in her hands. And so she will continue to live in my naughty imagination, tucked safely away and hidden.