C edges me every day and if she's away she likes me to do it myself. It's a part of our routine to exert her Dominance. This leaves my balls constantly full and me always very frustrated and hard, thinking about her lovers enjoying her body.
Whenever she pushes too far or I'm late warning her that I'm going to cum she takes her hand away and likes to watch me ejaculate my ruined orgasm away and then encourages me to eat my cum.
This is as close as I ever get to a hands free orgasm, but I can foresee a time when C leaves me so full that I just go off before she's even touched me. Maybe this is something that we'll develop towards.