My wife Kim just told me that her sister Luanne was paying a visit for a week. I was a little ticked off that I got such a short notice. Luanne, who was nineteen, just finished up her first year in college. She told my wife that she didn't want to spend the whole summer with their parents. Would we mind if she stayed with us for awhile? I didn't say anything to my wife about how I felt.
The next day Luanne arrived. I hadn't seen her in nearly two years and she had grown up. Luanne was taller and she let her auburn hair grow out. She was also getting more bolder. Luanne was wearing a shirt with no bra on. She didn't have very big tits but her nipples were showing. I tried not to be too obvious but I was looking at her chest.
My wife made dinner that night and afterwards we talked about Luanne and school. The next morning my wife said she had a bunch of errands to run and off she went. I walked into the bathroom to get cleaned up. There is a door between the bathroom and the bedroom where Luanne was staying. I could hear noises coming from the other side of the door. I knew I shouldn't do it but I cracked the door open.
I was able to peek in and there was Luanne naked on the bed. She was running her fingers across her pussy and moaning pretty loudly. I pulled my briefs aside and took my dick in my hand. I was stroking myself as I kept an eye on Luanne. I must have made some noise and Luanne called out.
"Is that you, Rich?"
I just had to see her. I opened the door and walked into the spare bedroom. Luanne looked directly at my crotch. My boner was bulging through my underwear.
"I heard you and I had to look in," I told Luanne.
She motioned me to come closer to the bed. I walked over and Luanne sat up. She reached for the material of my briefs and pulled it down. My cock was now exposed to my young sister-in-law.