Robert doesn't let you

You gently push Robert off of you and stand up from the desk. You start towards the door, but you suddenly feel a hand on each shoulder and you are pushed to your knees. Robert steps in front of you holding his large cock. You gasp in shock, his cock looks even bigger than it felt.

"I'm glad you like it," snickers Robert, "is it bigger than your husband's?"

"Yes, it is," you admit. "I've never seen a cock this big before."

"Now you know the rumors are true. Now shut up and suck me." He grabs your hair and pulls your face towards his cock. You open your mouth and wrap your lips around the head. You suck gently and run your tongue around the head. Robert groans his appreciation of your technique. You decide to take him deeper. You let him guide you as he pushes your mouth further on his cock. You take about two-thirds of his cock down your throat before you have to pull off. You cough a few times before you go back to his cock.

You decide to just slide your mouth up and down the first half of his cock, as you use your hand to jerk off the other half. This goes for several moments before he stops you.

"I don't want to cum yet. I need to fuck that gorgeous pussy of yours."