Test of Control/Training Session 1
I insert the nozzle of the bottle of lube into my victims anus, and squeeze a liberal amount of cold lube into them to get them ready. I then probe their opening gently while slowly stroking their cock. First I use one finger, then two. Eventually I replace my fingers with a dildo, and really start stroking in earnest. When they're on the edge of orgasm, I remove my hand from the penis and steadily drive my dildo as deep as it will allow, let the edge fade and repeat the process as necessary, pumping the full length of the dildo in and out from the base to the tip the whole time I stroke the cock.
Sometimes, after a few edges, I like to employ a technique where I take the dildo out entirely before plunging it back in, balls deep. If kept up long enough along with only minimal penile stimulation, it causes the slave's ass to gape and then eventually spasm in an "ass-only" orgasm. The loss of control of your body will drive you up a wall and break you.
My supervisor, though? She'll make sure your cock gets absolutely no attention whatsoever. She would ruin you. You wouldn't want that.
Don't worry, if you keep all that cum in your balls you'll be fine. Maybe I'll even choose to let you serve me personally. Would you like that? You would spend every morning worshiping this ass. I should warn you though, I can get pretty kinky.
If you want to serve me, say: "Please let me serve you Miss".
Good. You're doing well.
Keep stroking and continue.