We are very open about masturbation etc, but I have a little kink for private self pleasure stuff. I get off to the idea of her enjoying her alone time completely for herself and no one else. I love to fantasize about what she might read, watch, think about, or listen to as an aid in cumming. Especially if it's something she's yet to tell me about. So I'll take her little vibrator out of the dresser, smell it for traces of pussy, and jerk off while I picture her using it to make her pussy feel as good as possible. I'll even use the vibrator on my cock during these times. I'm sure she would have an issue if I told her I do this, but it's kinda hotter that she doesn't know.