I (M26) would spend a lot of weekends at my cousins house and would hang out with them alot. I remember when we would hang out, we would sit at a table and I would get hard randomly. One day she set her foot on my cock and started rubbing it. It really turned me the fuck on and I was pulsing through my shorts. We even had a code word for it when I wanted her to do it. But the best one is when I was sitting on the couch and she was laying on the floor and she backed her feet up on my cock and start rubbing it intensely. The scary part was we had family in the kitchen next to us. After about 10 minutes of her rubbing my cock, I came hard in my pants. I had to take a breather just to recover. I tell her to stop and get up to go clean myself. If you read my last story about jerking off next to my Cousin, this was her sister and today id rail the fuck out of her if she'd let me. She grew fine. Id even like to repeat what we used to do as teens.