You're a recent ex of Mine, and you stop by My house to try to convince Me to take you back. I've been having sex with My big dick ex again, and there's no way I'm going back to your tiny dick. I quickly get tired of your begging, and offer a solution. If you can last until I give you a cum countdown, then you can have one last go with Me...but, if you can't last, then you'll give up and be My cuck. You quickly accept, assuming that you'll be man enough to last, and win your prize. Once I begin to tease you with My body, you begin to realize it might not be as easy as you thought. I grab My huge dildo, and shove it into your mouth. To your surprise, you cum instantly, losing the bet. I laugh at you and humiliate you for not being man enough to last 10 minutes. I then begin to notice that your cock is getting hard again. I make you suck the dildo for Me as I tell you about your new life as My cuck. I tell you about all the gay things you'll do for My new man. You cum again, and I make you slurp it up off the dildo, as I prepare you for your first night as a cuckold.