"I'm yours" Which I know doesn't sound like something a master says to a sub, but since we have a mixed relationship-vanilla, him mostly top, but I have occasional moment-it's nice to hear. Almost as delicious as saying it back to him, lying naked in his arms, afterglowing from whatever type of sexual activity we just finished (or are taking a brief break from to catch our breath, visit the bathroom, get a drink and a smoke, so we can start again!)