My gloomy older sister is super interested in my penis!? Hanamori Natsumi NACT-075

My older sister, Natsumi, has always been gloomy and introverted. She has no friends, doesn't work, and spends almost all her time in her room. One day, harboring a sullen resentment towards my sister, I suddenly became curious about what she was doing in her room and secretly peeked through the crack in the door. What I saw was my sister painting herself, using her naked body as a model. I was unexpectedly attracted by the eroticism of my sister, whom I had thought was very plain, and I started masturbating. Afterwards, while I was asleep, my lower body suddenly felt incredibly good… I opened my eyes and found my sister licking my penis!? Even after I orgasmed, she kept muttering something, as if she found it disgusting, and then she even came into the bathroom! My sister's awakened erotic curiosity pushed me to my limit…