Mistress has the small submissive streak in Her. One that only The Boyfriend can find. He's the only one that can effectively deal with it also.
Sometimes The Boyfriend spanks Mistress' beautiful and ample ass. He doesn't do it in front of me and most times I am in the other room, already diapered and in bed. Yet i can still hear.
i've had orgasms in my diapers just from the sounds.