I am fine permament effects but lay them off from my char's sexual organ. Simple as that. You could go about forced removal of my char's offensive body part which harmed said slave; his teeth example. Altough it means for diet purposes he can only given soup (or cut meat to small enough pieces he does not choke himself with them or leave back row teeth alone so he can chew with them but have no front teeth anymore). Whipping which scars him also works as does removal of a toe or a finger (or remove a ear). Also you need decide was it hired retainer or prized slave. Retainer is paid already and is less value than prized slave but up to you.