This is a question that can be answered differently by every master I would say.

I can only anser for myself.

A submissive in the most simple terms should be willing and able. Should in all actions make the master feel so. Should be able to anticipate needs. These can stem from lighting a ciggarette to a kiss on the cheek in times of need to the more dominant and subversive desires of the master.

There definately needs to be an emotional connection, and dare I say love. Most importantly trust. A submissive gives away a slice of autonomy and trust his/her master, and this is something not given lightly.

I have more. But wont go on!

Be good!