Yes! Have him pull out!

"Sa- Sam! You... Pull out!" It takes every bit of will left in you, but you manage to speak the words. Sam, blessedly, stops moving immediately. The roiling pleasure calms down as he pull his head back to look you in the eyes. But he doesn't pull out, he doesn't look shocked, as you thought he would. He is smiling. Not the kind, cute smile that got you into this mess. It's cruel, cold smile of a predator who knows he's caught his prey. "No, " he says. One word, utterly passionless. As if it were the simplest thing in the world. But it shakes you to your core.

Before you fully comprehend Sam's betrayal, let alone before you can begin to resist, he resumes fucking you. There is no hint of his earlier passion. He does't kiss you, his hands don't caress you. They are locked around your neck. He is fucking you purely for him now, but that is enough. The orgasm which had started to fade flares back to full **** in an instant, taking your will and your strength both. And then, as Sam buries himself completely inside of you one last time, an even greater ecstacy begins. It is a pleasure greater than any sex could give you. It is no physical pleasure at all. It is simply the greatest joy possible: You are with Master, and He loves you.