Got her a towel

"As you wish", you answered, walked to the bathroom and got her a towel. When you returned, you looked down at the stains on her pale skin and offered the towel: "Here you go."

Marie looked annoyed and pushed the towel away: "I asked you to clean me up, so would you please clean me? Be a good boyfriend for once!"

You sighed and knelt on the bed, right beside her. When you reached for her soft skin, you had to admit than it was a huge turn on seeing your girlfriend beeing covered in cum. You started with her legs and wiped up the cum, then you cleaned her belly. There was still cum left on her pussy and so you moved closer.

"This is where the fun begins", Marie smiled at you and let out a little moan when you touched her pussy with the towel. You gently wipe away the cum and your girlfriend asked you: "Please, play with me a bit."

For a minute you stopped cleaning her and started to rub her clit. There were some cum left inside her pussy and you lubbed your fingers with it. Marie moaned when you entered her and you kept fingering her. The movement caused some cum to leak out and you caught it with the towel. Marie enjoyed your actions for a minute or two and then stopped you by grabbing your hands.

She looked deeply in your eyes and asked: "Could you please lick me? That would be so hot!"

"But there is still cum inside you", you objected.

"Wouldn't that be hot?" Marie grabbed your boner and tugged on your dick with her free hand. "I mean, it is your cum and i bet we both will love it."

"Hm", you considered it. Admittedly, you fantasized about licking your own cum off her before, but you never thought about licking off the cum of another man. "I mean it's not just mine."

Marie didn't responded first but tugged your dick a bit rougher and it got painful as she worked her hand up and down your shaft. You freezed because of the pain but that didn't stopped her from jerking you. She stared into your eyes and then reached between your legs with her hand, grabbing your balls. With a tight grip she massaged your balls and said: "Oh, don't be shy. You would love to, don't you? And by the way, your dick tells me, that you already enjoy it. And you will get a reward later."

She was right, even her tight grip didn't changed your arousal. You lowered your head down into her crotch and got in a pretty uncomfortable position, because Marie never let you balls go. You licked her clit and Marie started to stroke your dick again. Soon your face had been covered in the juices and after a short inner resistance you pushed your tongue inside Marie's cum-filled pussy and tasted her. There hasn't been much sperm left inside her but the taste had been unmistakable and you felt that a mix of juices ran down your chin.

Your girlfriend enjoyed your affection and she had been so aroused that she came off very quickly. The whole time Marie had jerked you off and you felt the tension inside your balls. When she orgasmed, she let your dick go and focused completly on herself.

"So", you asked a minute later, after she calmed down and pointed at your still raging member, "how about my reward?"