Thanksgiving

Not much to say, I went over to my brother-n-laws for turkey. I was sitting next to my sister-n-law, my wife's sister. We were on a couch watching YouTube on the big screen T.V. I looked over and I see my sister-n-law scratching at her pussy. 5 minutes went by, I see her hand down her pants and rubbing herself. Everyone was focus on the T.V. while I was watching her rub it. I was told once that she don't wear panties. My dick got hard but I didn't say or do anything. She stopped and sat there watched the rest of what we were watching.