Total Obedience
"So, are you excited for the blue balls that i'm gonna give you slave?. Are you excited to lay in bed with your cock aching?. With your balls filled with cum, are you?. Because that's what's gonna happen my little, incompetent, beat off boy.."
(You try to plead with her)
"Aww, don't you feel honoured?, aren't you excited about it?, of course you are. Well, you know, your mistress also mentioned in that letter of hers that you hadn't have a full orgasm in quite some time.."
(You lower your head)
"Hmm, do you like that feeling slave?. That desperate, horny, nagging feeling. Stroking your full, hard cock with your weeks worth of cum in your balls waiting to be released?. Oh well, tighten your grip a little, but don't jerk faster yet. Show me how good it feels to stroke your cock for your mistress"
(You keep going..)
"I bet you can feel your nuts tighten already slaveboy. Just keep going like that, convince me that you'll be obedient from now on slave!"