"No! Your fingers are grinding against me!" My cousin, who's also a teacher at my school, Kyou, is going to stay in my house!? My beautiful sister, who doesn't have a boyfriend, seems to like Kyou! I'm planning to help them and bring them together, but... I got interested in Kyou and made a big mistake!! He tickles and touches me while trying to pull a prank on me... but then, he starts to rub my breasts, caress my butt, and even touch my private parts!? I don't like it, but he gets the wrong idea and stimulates me even more! Finally, Kyou who has been lustful, is going to cross the line that should never be crossed!? (Source: Shusuisha, translated)