Possible Clues:

• One is bound to be in this
• Three bits of three and nothing more for slavery
• At last everyone is in with this for slavery of a sort
• The slave is in this for most of the three, and that's the whole of it
• Short period in incredible servitude
• At last one is entirely dominated in this
• State of subservience
• Unlikely to have short time in captivity
• One held in bondage
• Enslaved person