SSNI-827 Being a sex slave for my cousin

Tsukasa used to be my brother's ex-girlfriend. He treated her like a sex toy and borrowed a lot of money from her, then he cut off contact without saying a word. She found me and I wanted to apologize on his behalf and pay her. The amount of money was quite large so she had another request for me to apologize to, which was to let her do all the things my brother used to do to her...!