I am considering buying my Knight a chastity device. A year ago, I was completely against the idea because I expect him to follow my rules about masturbation simply because they are my rules. To the best of my knowledge, he has never broken those rules. Or at least not in the last 5 years or so. I suspected he had taken matters into his own hands once, several years ago. I made it very clear how I felt about it, and he hasn't done it since. The only unauthorized orgasms I'm concerned about are those "oops" that happen when I'm teasing him, and of course, a device won't change those.
So.. why am I considering a device? My devious little mind has decided it might be fun to keep him locked when he's at work, or otherwise away from me. It could be fun to send him emails at work about how I'm going to unlock him him when he gets home to play for a bit, and then lock him back up without release. I send him teasing emails pretty regularly, and if he were locked it would give me one more way to tease and play. I like the idea him having a constant reminder of my control over him. Yes, he wears a ring, but it's not the same.
My only hesitation is that we've not talked about it much, and I'm not sure how to bring the topic up. My Knight is still a bit uncomfortable talking about his being submissive to me, and even though he likes orgasm denial, he's not up to discussing that, either. I'm probably going to buy him one and surprise him with it. I'll present it as a game I want to try, just like I did orgasm denial. We'll experiment with it and see what he thinks about being locked.
So... that leads me to my next question... what would you recommend as a first device? I know a lot of people like the CB6000, but I'm not looking to spend a whole lot of money on an experiment. Any suggestions? Any suggestions on how to size it? My Knight's cock is a bit bigger than average, is there a certain device that's better for larger sizes?