My younger sister 【ゆい】 has been a spoiled brat who crawls into my futon since she was a child. However, one day 【ゆい】 brought my junior as her boyfriend. When the three of us sleep in the same room, what comes from the adjacent futon is not a joyful voice but a heated, sultry voice... 'What the hell are you doing in that futon...!' Secretly making out in the bathroom・quietly having sex with internal ejaculation in her brother's futon・intimate close-contact sex with internal ejaculation. The sister who was spoiled grows moans quietly beside her brother—
