My sister who lives in the countryside came to visit me in my room in Tokyo! However, I have always seen my sister as a woman, and I started living alone as if I ran away because I couldn't continue like this... But when I met my sister after a long time, she had grown into an adult body and was my perfect match! I couldn't stop getting horny! But my sister was unaware of my feelings and spent the whole time at home in her defenseless loungewear, showing me her panties and breasts, so I couldn't stop getting an erection... So I naturally thought she had found out...?!