Never underestimate the power that intense isolation bondage can have on a strong str8 male captive. Several days, or more, of this can not only tire out and completely disorient the slave, but can break its initial will to resist. Hunger, thirst, the erection of its nipples (which you have kindly assisted at intervals), and the humiliation of being captive in its own waste, can make even the most hostile, resistant captive more compliant. Particularly with a aromatic bowl of broth in the room. Start with a “Yes, Sir” to get a sip of soup. The walls come tumbling down in short order.