When I went to her house for the first time after dating a cute girl, I found her rebellious sister, Naruha-chan, looking at me coldly...! Her cold attitude and face that was even cuter than hers made me excited. I couldn't control my erection and ended up touching her beautiful body while she was out, which was a sin... But at first my sister resisted, but before I knew it she was hooked on my dick! My sister, who wanted to have sex with me, started to get all lovey-dovey!