Let Derek dominate you

You pant for air, partly from the rough blowjob and partly due to your raging desire for Derek's cock.

"Face down, ass up," he orders you. You moan in excitement and turn over. You face towards the foot of the bed, with your head and chest planted on the covers and your ass stuck up in the air. Your fully erect cock swings below you. Stacy has already cum at least once, but she's still practically whimpering with arousal watching you submit to her lover.

"Fuck the shit out of him, Derek," she says throatily. "Show him how a man fucks. I want you to break in his tight ass the way you fucked me and make him beg for more." Then she starts telling you to beg for it.

You have no trouble complying this time. Derek pushes his erection up beneath yours from behind so that you can feel how much bigger he is. His horse cock pins your own smaller member up against your body. "I want your cock, Derek," you plead submissively. "Fuck me. Fuck my ass like you fucked Stacy."

Derek gets up on one knee with the the other foot planted next to you. Then he puts one hand against the back of your head and pushes it firmly down into the bed. His other hand presses down on the small of your back so that you arch even more dramatically for him. You are a little bit open from Stacy's strapon earlier, but you are still scared and excited when you feel Derek's cock pushing against your entrance. "Keep on begging me," he tells you. "I don't want to hear you stop begging. Tell me you want it. I want to hear where you want this dick and how you want it."