My cohabitation with my stepsister began, and I was captivated by her intense libido. She kept coming home late every morning after nightly drinking parties, and one day I happened to run into her on the stairs when returning from a convenience store trip. As I secretly stared at her upskirt, nearly getting caught, she suddenly invited me to bathe together in the quiet early morning. My erect cock pressed tightly against her big ass, and our heavy breathing wouldn't stop. Fearing my stepmother might wake up, we continued our erotic encounter in my room. Our illicit relationship as step-siblings grew even deeper.