We've always been on good terms, so I never once saw my sister as a woman... until the biggest mistake of my life!! I caught a glimpse of her nipples when she was dressed carelessly, and they were completely exposed! They were so beautiful, the perfect breasts I've always dreamed of! To my surprise, seeing her like that made me get incredibly hard! I couldn't take my eyes off her! But when my sister noticed my erection, instead of being disgusted, she seemed excited!? She let me touch and massage her perfect breasts as much as I wanted, and it eventually led to forbidden penetration! An incredible turn of events for this incest encounter! She even let me creampie her!