I started dating a cute girl and went to her house for the first time. Her rebellious sister, Naruha-chan, looked at me with cold eyes. Her indifferent attitude and even cuter face than my girlfriend made me excited. I couldn't control my erection and touched her beautiful body while my girlfriend was away, doing something wrong. However, the initially resistant tsundere sister eventually became hooked on my cock. She started to seek my body and became completely dere!