Just recently remembered something I used to do with a sub long before everything ended terribly and thought I'd share it here. 

Anyway, he used to work late hours at a university library, it'd be fairly empty so he could get away with talking to me on Skype. At first I had my fun giving him erections he'd have to hide at work, then I'd end up bullying him into touching himself at work.. on video for me. He'd always protest at first, it was adorable, but then I'd get really mean and he'd quietly give in... I'd make him edge. I think I even had him cum a handful of times. Other times I'd let him listen to me cum and not even allow him to touch himself.