My sister came home covered in mud. Despite my concern for her, she suddenly pulled down her pants... and to my surprise, she was peeing! In the hallway, the living room, even in my room! I was so shocked I couldn't speak. No matter how I tried to caution her, she wouldn't listen. Yet, seeing my sister with her butt exposed, peeing with her private parts fully visible, I naturally got a full erection! Was my sister aroused by her own act of peeing, or was it just the alcohol? Reaching out to my erection, she indulged in the forbidden act of incestuous sex with her brother, climaxing repeatedly!
