Living alone in my room, I finally unleashed the sexual desire of my asexual sister who had no interest in sex, discovering her arousal trigger on her nipples! Awakening as a wanton slut, she was drained of every last drop of semen. Kinoshita Aoi FPRE-217

I'm a college student living alone not far from my hometown. I have an older sister named Sunflower, who's also a college student. Because she's too beautiful, my parents don't allow her to live alone, so she's forced to stay in our hometown. To relieve stress, she comes to my room to play her favorite games, continuing this routine. Today, Sunflower played games late again, and I urged her to go home, but she refused, saying, "If I go back to my hometown, my parents will nag me, and I don't want to go back." Then, Sunflower noticed that I had been looking at her with lewd eyes for a long time and made a suggestion. That is... while borrowing games in the room, she would lend me her vagina. Sunflower, who still doesn't know what sex feels like, has a very low threshold for sex. Ignoring my excitement as a virgin, she casually made this suggestion... In stark contrast to my frantic excitement and vigorous hip movements, she didn't react at all. "She still wants to hear erotic sounds..." I thought, and studied hard, finally finding the switch that made her feel good! Having discovered the previously unknown pleasure, Sunflower stopped coming to play games and started coming to have sex...