He's not planning to. The Doctor has nothing he wants.

Although.

There is a bigger chance Soushi might try to spook him by trying to be more clingy and just test how far he can go until the Doctor runs from him and Soushi wins the bet over how he can hate him if he tried. I think after the sinkhole moment, it might awaken his more demonic instincts. It's about time he returns to the dark side...