My father remarried, and my sister and I got a step-sister. She was cheerful and pretty, but I couldn't take my eyes off her breasts and hips....... Then, one day, my step-sister seduced me, and I lost control of myself, and we ended up having a physical relationship! What if my family found out ......? But my step-sister taught my honest sister what it was like to have a good time, so before I could react, we had sex without my parents knowing!