Push her head towards your cock.

You slide your head onto her shoulder and slightly push down. Sarah gets the idea quickly and tosses her hair back over her ear.

"You must enjoy getting head more than any guy I've ever met," she tells you. "Usual rules?" she asks. "I'd better get something in return," she challenges with a smile.

The 'usual rules' explain that Sarah gives head only if she orgasms later that night. She enjoys doing it, but she knows men all too well, and she's gone unsatisfied many nights (not with you).

You groan as you feel her hot mouth swallow you all at once. Her lips form a tight circle around the base of your dick, and she pulls up towards the head. Her hollow cheeks look amazingly erotic as she slides back down slowly. The entire time she moves, her tongue is dancing on the underside of your shaft. From time to time, she hums, sending incredibly powerful vibrations throughout your body.

You reach down and slowly pull away the shoulder straps to give you access to her delightful tits. She squirms as she tries to let the garment fall, and soon it is around her ankles. She never leaves your cock unattended however, and soon she is bobbing up and down on your shaft. You watch with genuine gratitude as your girlfriend looks into your eyes. As she keeps them glued to yours, she pushes her tits up with her free hand. That is the beginning of the end and Sarah slides her mouth wetly up to the head of your dick and begins fluttering her tongue in her mouth. In seconds, ropes of cum are streaming down her throat, and she swallows it all. She cleans off your softening dick and stands up, removing herself from the lingerie.

"Thank you," you whisper. Sarah smiles and straddles you, running her fingers across your neck and shoulders.

"Your welcome, baby. Now how are you going to repay me?"