Gave my sister in law an "accidental" flash

I'm a little obsessed with my wife's sister and have already posted about my fantasies over her and thinking about her too much. Well today I crossed a line.

She was at out place while our kids had a play date and when I got home I quickly jumped in the shower before dinner. Knowing she was downstairs meant I couldn't help but have a little play while I washed myself down.

I got out the shower and went across rhe landing to my room when I heard someone say hello. I turned and saw my wife's sister standing there.

Don't ask me why but I dropped my towel and stood there naked in front of her. We stood there for a short time just looking at each other. After what seemed like ages she smiled at me and I turned and went into the room to get dressed.

I've played with myself so much thinking about what I wanted to happen.