My sister, who lives in the countryside, came to visit me in Tokyo! However, I've always seen her as a woman, and I knew I couldn't continue like this, so I ran away and started living alone... But when I met her again after a long time, she had grown into an adult body, and she was my perfect match!! I couldn't stop getting turned on! However, my sister, oblivious to my feelings, spent the whole time at home in her defenseless loungewear, flashing her panties and breasts, and I couldn't stop getting an erection... So of course I thought she'd found out, but...?!