My horny little slave has problems keeping his hands to himself. You think very highly of that thing dangling between your legs. You spend so much time thinking about your dick. It's distracting you from really submitting and serving me. You know what this thing is, don't you? It's a chastity device. I'm going to lock it on your dick until I decide to release you for a maintenance orgasm. Then I'll be locking you right back up.

Chastity is the best way to focus your attention.