Decides to reveal she is a cock-whore

Julie's lids slipped halfway down her eyes and she looked at him coyly.

"You know Mark... I love cock and I'm going to make you never forget it."

Mark raised an eyebrow and imagined it might be fun to watch her get skull-fucked by some of his friends. But for now, his penis needed attention.

He took out a marker from his pocket and drew -COCK WHORE- on her forehead. "You are not to wash this off, okay! Otherwise I'll put you in a chastity belt and you won't be able to play with that wet little pussy of yours until I say so."

Julie was getting off on this. She knelt on the ground with her head tilted up and mouth open. Begging for him to put his cock in. God! This was a fantasy come true! As pure as she had grown up - Julie had the heart of a slut.

Mark grinned. "Want cock? Want my big dirty cock in your mouth? After I'd been fucking other girls?"

Julie nodded. "I want your dirty cock... I want to suck it and lick it clean...."

He stepped forwards and put it into her mouth. The bit about the other girls had been a lie, but the idea that she didn't care was erotic and he told her all the dirty things he does to filthy little cock-sluts like her.

She groaned and moaned while expertly blowing him.

After a while he fucked her face harder and came long and deep. She swallowed and cleaned him up.