I won't refer to anyone other than the one who ownes me as Master. It's not a title I would use for someone else. Except for one Mistress online, who hates being called Ma'am. I refer to her as Mystress and my former owner was extremely surprised by that. My preference is to use Sir/Ma'am. Although I have also been reprimanded for using that with those who don't own me. I use it as a term of respect, but it seems some doesn't want any title except by those who they own.