I always fancied my sister-in-law. She's very much like my wife, only 10 years younger. She has the same big tits and gorgeous ass. We have flirted with each other for years. She is also fully aware of my huge panty fetish (I assume my wife told her), and takes pleasure in bending over in front of me to expose the back of her panties or thong.
One day after working in the garden I came into the house to see my sister in law in the lounge. As I stood at the door, she reached over to pick a mug up off the floor and exposed a stunning sexy red thong. My eyes must have been on storks as she turned round, looked at me and smiled. She knew exactly what she had done.
My bedroom was directly opposite the lounge and from where she was sitting she could see straight in. I excused myself and said I was going for a shower, firstly because I'd been working all day but also because she had made me so horny. I stripped off down to my boxers and walked past the partially open bedroom door a few times. On each occasion my sister-in-law looked up at me and smiled. She must have noticed the large swelling in my boxers!
I went for a shower and gently stroked myself thinking about the gorgeous thong and what her ass must look like in it. I didn't cum, and got out of the shower still as horny as hell. I wrapped a towel around my waist and went back into the bedroom. I stood at the door and she looked at me again and smiled. I don't know what came over me, but without thinking I dropped the towel, exposing my full erection to her. At first she looked a little shocked and I though what have I done, but within a couple of seconds she smiled at me again. I took my cock in my hand and slowly masturbated in front of her. At this point she couldn't take her eyes off me as I started to stroke faster and faster. Within a few seconds I exploded all over the floor. She then stood up, walked out of the room towards me, smiled and then turned down the corridor to the toilet. I cleaned up the mess, dressed and went back into the lounge. When my sister-in-law reappeared she acted like nothing had happened.
She told me later that when she went to the toilet, she pulled her jeans down and quickly had her hand in her panties and a finger on her clit. She said she was so wet and came within seconds.
This was just the start, there was a lot more to come!!
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