@Haibane: Ryuuji's relationship with Mizuki are somewhat three-fold. At home, under normal circumstances, she is his little sister and usually treated nicely if not slightly demanding. When he is... well... horny so to speak, she is a pet, to be used as he see fit. And lastly, at work, she is his personal secretary and event organizer.<br/><br/>All of his slave employees will be naked, that is one ground rule limiting them although they will wear a name tag that shows they are employee at the company. The ones who has the job which require them to move nimbly (Cleaner, shop assistant, etc) are allowed to walk on two feet although they will wear additional legs irons / leg cuff to limit their movement just enough so that they can't run away even if they try while the ones that doesn't requite much nimble movements (Typist, Secretary, Receptionists, etc) will be required to walk on all four and wears both hand cuffs and leg cuffs. Of course, the slaves who works as slave assistants in the store are also purchase-able if the customer takes a fancy on them.