You saw Byakuya and Toko arguing in the library, while Byakuya looking disgusted and mad at Toko,

Byakuya: "How many times I have to tell you? I won't date you. You're repulsive, truly worthless to me."

Toko: "B-But Master! I-I can do a-anything you want me, P-Please, l-let me be with you, I promise that I'll behave!"

Toko seems slightly nervous at Byakuya's rejection, yet she won't give up so quickly. Byakuya looks disgusted and annoyed, while his arrogant usual tone is more notieable.