Content summary: Arisugawa Yuna's sister, who was still very leisurely before becoming a social person, introduced her boyfriend Shigemori Jin to her. They make people think that they are a stable and gentle couple, and they are a perfect couple. That's right, if I hadn't listened to the sound coming from next door that day and hadn't looked, it wouldn't have turned out like this... "——Could it be that you heard it that day?" One day, he showed the same smile to I'm getting closer...! ? "You're different from Yumi, this is your first time!" She obviously wanted to resist, but the honey juice kept overflowing there, and he was sucking her——. I, I was hugged by my sister’s boyfriend today.