As you lick up and down Mark's cock, you see him flip the coin and wish for you to forever be his slave. You forget what you're doing for a moment and watch the coin as it hits the ground and lands on heads.
You feel a collar on your neck now, with no way to take it off. Mark now controls everything you do, you are physically unable to disobey him. He tells you to get back on the bed and sit on all fours with your butt in the air. Now as his slave, you willingly obey him and put your ass up, hungry for his cock.
He happily obliges again, and fucks you like you've never been fucked and you can't get enough. You grind your hips back against his, working your cunt on his dick. You feel him get harder and he fucks you faster. You feel yourself start to come, and as you do he thrusts inside you filling you full of his seed.
He pats you on the ass and calls you a good pet as he pulls his cock out of your wanting pussy. Now that you're his slave, all you want is his cock all the time. However, he decides he'd rather have fun with you and he puts the chastity belt back on you and locks it back up. You become frustrated as you can't stop feeling horny but now you're stuck in a chastity belt, locked away from satisfaction.
"You'll play when I say you can. Meanwhile, you're going to have to wear this."
You groan and resign to your fate as his pet, and he picks up the coin and puts it in his pocket.