"Ok, now grab your cock with your whole hand. I'll instruct you precisely how to stroke it!"
"Yes mistress"
"Go ahead start jerking it. Steady long strokes at a nice, slow pace slave. I want you to look at me and worship every inch of my body with your strokes. Show me that you mean it slave!"
(You start stroking yourself)
"So last time you had 2 slip ups, right?. Well, actually it was more than 2. but. Well, this time you'll have zero slip ups throughout the whole, entire evening. Is that clear?. Not a single one!"
"Y..y..yes mistress Stella"
"Very good. You know, I thought about what i'm going to do with you slave. So this is what's going to happen. The both of us will play a little game together since I know how much you like to play. To put it simple, I'm going to try to force you having an ruined orgasm."
"P..p..please mistress"
"Silence. Listen to me slave and keep stroking your little cock"