Especially hands-free ones. Usually happens to me after about a month or so, then I'll spontaneously squirt-dribble, usually when eating my wife. I know this is forbidden, and I'll get punished for cumming, but I just can't help myself.
It is an amazing feeling to feel the sensation building and then cumming hands free in chastity. I love to try to edge in chastity and lick the cum oozing out.