I arrived home from work around 6pm and entered the house through the front door. I could smell dinner cooking and could hear some conversation coming from kitchen area. When I entered the kitchen, I saw my wife standing next to the stove and her sister near the table setting up plates. Both were wearing long sleeve silk men's shirts in a size that just barely covered their ass. My wife turned and told me that dinner would be ready shortly and that my sister in law had did most of the cooking. I turned towards the bedroom, kissed my wife and was heading out of the kitchen when my wife again instructed me to not ignore her sister. I grabbed, my sister in law, pulled her towards me and kissed her while probing her mouth with my tongue, while reaching down and cupping her ass with my hands. As I broke away and headed off to change out of my work clothes, I heard my wife telling her sister that she'll finish up dinner.
I grabbed some clothes and was about to change when my sister in law entered the room. She stood there for a minute smiling. Not knowing what was going on I asked her what she needed, all I got was a stare. She then told me she wanted to give me a quick back rub as she knew I had a long day at work. She instructed me to change into my shorts then lie on the bed and she would rub my back. I do love my back rubbed and figured if my wife said she'd be finishing up dinner that it must be ok. Not fully understanding how she planned on rubbing my back, a climbed in the bed and laid on my stomach. She then climbed in the bed and sat across my legs and started rubbing my lower back then leaning forward and reaching my upper back and neck. She then repositioned herself at my hips and continued rubbing my back.
It was a few minutes and I heard my wife hell that dinner was almost ready and that I probably could use my chest and shoulders rubbed also. My wife now standing at the door told me to turn over so that her sister could finish my rub down. Needless to say I now had an erection and wasn't quite sure I wanted to turnover. I slowly rolled over and my sister in law stated to my wife that she must have been doing a good job as I was showing my appreciation. She then positioned herself over my erection and slowly started rocking back and forth. It felt as though we were making love except we had fabric between us. My wife then called out that dinner was ready and my sister in law climbed off me and left the room. I soon followed and we had a nice dinner while they discussed some things as though I was not present. A lot of it was whispering, but I could tell it was about me. Every once and a while they would stop and look at me then giggle. About thirty minutes had went by when I said I was going to take a shower before we watched the game on TV. My sister in law stated that she'd do the dishes and my wife said that she'd join me in the shower. So off we went.