As you sit straddling your friend the last vestige of resistance breaks inside your mind.
"I'm a cock hungry slut and I love it!"
You can feel Mark's cock inside you straining for release, you grin wickedly as you decide how to give it to him. Carefully you slide off him and start kissing your way down his chest and flat muscular belly. Mark starts to protest feebly as he understands whats happening but his words soon turn to gasps of pleasure as you take him in your mouth, tasting your own juices on him you start sucking eagerly on his member, teasing his head with your tongue then letting him slip deeper into your mouth. You feel his hands on the back of your head pushing you down on to him for an instant you choke before some instinct tells you how to relax into it then you're deep throating like a pro.
"God this is such a thrill" you think as your best friend fucks your face. Just a few hours ago it would have been an unthinkable humiliation but now you relish the feeling of power it gives you, knowing that Mark, any man, would give almost any man would give almost anything to find release with a woman like you and that you know exactly how to please them in ways a born woman never could.
Mark groans and his hips buck as he shoots his load into your eager mouth, you slurp down his cum like it was nectar before finaly looking up to see Mark smiling down on, coin in hand...