Keep stroking. The test is almost over.
What if I told you that my favorite thing in the whole world to do is to fuck slave boys with my strapon dildo? And because we are here to teach you that our pleasure supersedes yours, you'd be taking a lot of my strapon in your tight slave butt. Does that turn you on? Do you still want to serve me?
Jerk your cock and imagine what it will feel like as my girlcock penetrates your ass unmercifully. Stroke for as long as you would like before you continue.
Soon you will know exactly what will I will decide will happen to your cock and balls for the duration of your training. You will also come to learn how long your training is to last.
Give me one last edge, and prepare to submit to my decision.