Learn to keep stroking
Hello little slave, I'm Trixie.
Your Mistress sent you to me, because you have a problem to keep stroking your cock without cumming? Your Mistress tells me that you reach the edge too fast, and you always have to stop and cool down. She can't enjoy watching you stroking that cock with a nice pace, without you stopping all the time. This has to change slave!
Lucky you, that you have me, because i specialized in training slaves that way. My Services are not cheep, and your Mistress paid quite an amount for this Training Session with me. But i bet she took it from your account.
She even allowed me to let you cum, if you did a good job. But for the time being you are not allowed to cum, if you do i'll throw you out of my house, and tell your Mistress. I bet she will be 'very glad' to hear that you failed the training, and cummed without permission. My guess, you'll be lucky if she still wants you as a slave after that.
I think we should get started with the Training. I hope you brought your lube, you will need it for this Training. No Lube, No Training!