A sister who is shocked to learn that her beloved older brother has a girlfriend for the first time. The sister is jealous and tries to send 'Let's break up' via LINE on her brother's phone without his permission. She even says, 'How dare he have a girlfriend while having a sister like me!' She's completely crazy! But while she was passed out drunk, her sister had sex with him and rode on top, grinding her hips, and it felt incredibly good!
