My stepsister became part of my family when our parents remarried. Her breasts are large, radiating a sensual charm. Maybe it was inevitable that I didn't truly see her as just a sister, leading me to take her out or stay overnight at hotels. Faced with her soft breasts, I lost all reason and gave in to instinct. The moment I thrust inside her bare, my heart was gone. I know our parents would never accept this relationship. Still, I'm tormented by regret and guilt.