Comment by Yuki on Yagami_Light

Permanent Secret Slave, he's going to get fed up with the sh** she tries to pull and soon enough he tricks her into signing a magical contract (which magicians cannot break no matter what) with three conditional "requests"  she has to fulfill to be forgiven by him so that he doesn't ruin her reputation publicly but the only thing is he decides he will never finish off the last of the three requests so she's permanently stuck with a leash around her neck by him essentially making her his permanent slave.