You try to finish yourself off

As Carrie begins showering off you start thinking of your sister's cum caking your girlfriends face. You think of how thick it was and how damn much of it had been matted into Carrie's hair.

Your dick throbs with neglect.

You know Carrie said that you couldn't cum if you didn't finish and it is your fourth time but you can't stop yourself.

You take your dick in your hand and begin pounding furiously, **** to cum but your cock has taken quite a bit over the past 24 hours and you are finding it hard to finish.

You try everything you can think of: picturing Carrie's body in the shower, water cascading down her heaving tits and her round supple ass; you think of how Carrie had felt as you fucked her; you think of when your cock was the object of Carrie's desire -- desire she now seemed to have for another. Not just any other cock, but your own little sister.

You don't know why but the thought of your sister's cock and the absurd proportions Carrie had described sends a surge through your body. You start pumping faster, feeling yourself getting close.

You don't even hear the door to the bathroom open up as your minds eye takes in every inch of what you imagine your sister's cock to be. You struggle to think of how Carrie could fit it inside her but you can picture her riding Sam, your sister's cock invading places you couldn't reach if your cock was triple it's size. You think of Carrie's belly swelling with Sam's cock head as the two lovers cum together, unleashing a torrent of fluids.

You do the same, well you try to. After all the attention you are unable to produce anything more than a dry orgasm that fails to fully slake your thirst for a proper climax. As you begin to focus back on reality you notice Carrie standing in front of you looking none too pleased.