Sister offered naughty threesome sex with boyfriend

As soon as I woke up, I noticed my sister and her boyfriend engaging in steamy sexual activity in the bedroom. I couldn’t tear my eyes away and found myself getting aroused, so I discreetly pleasured myself while watching them try out different positions. Suddenly, my sister caught me masturbating. Instead of being angry, she invited me to join in on the sex fun with her boyfriend. We ended up having an intense threesome experience filled with hot and hardcore fucking.