My Master calls me his submissive. i love to please Him, but he doesn't control every aspect of my life. He is a leader and He dominates and disciplines me, but He also lets me challenge Him and have my space. We have also been best friends for a long time. We would go target-shooting, or play computer games and debate on things. That hasn't changed after i became His.
i guess, being a slave requires more control. A slave is owned, a submissive is lead.