My new step-sister is always horny and tries to seduce me whenever she gets the chance. We're not blood related, but we're still siblings, and I kept refusing her despite my erection. One day, when I came home from school, my step-sister was waiting for me at the front door and suddenly sat on my face! I was suffocating, but my crotch was rock hard! Seeing me like that, she took her chance and devoured my erect cock! Suddenly sitting on my face is unfair. I couldn't keep my sanity!