She really wanted to find someone to take care of herself, and at the same time, she also wanted to care about herself. Their relationship is like that of brother and sister, but not just a simple brother and sister. She likes the hazy and ambiguous feeling.
He didn't expect that this sunny girl who called him brother would have a hobby of being spanked. He learned from her that there was a strange emotional way called SP. He decided to let him leave such strange emotions, but he fell into it.