Get her to sit on your cock.

"Sara, wait," you tell your roommate, cupping her chin to signal to her to stop bobbing up and down your cock. "I want to try something different..."

"Hmm?" she wonders with her mouth full of cock.

"I want..." you pause to look at the other girls, who were quietly watching you with their hands between their thighs, before you continue, "...you to sit on my cock."

The redhead pops your cock from her mouth and grins, "Of course!" She stands up and excitedly strips off her clothes. You offer your hands for support as she climbs up on the armchair and squats over your erection. She rests her hands on your shoulders and gives you a mischievous smile before lowering herself down onto your dick. The two of you moan in unison when her cunt fully engulfs your cock.

"Hey, I thought you were suppose to leave some cock for us!" Jen whines.

"There's enough of my cock for all four of you girls," you groan as Sara starts grinding on your lap.

"Just don't cum in her!" Jen complains.

As Sara bounces up and down on your shaft, you reach up and cup her flailing tits. She looks at you longingly, biting her lower lip to suppress her moans, while she furiously brings herself to a climax. She lets out a scream of orgasmic bliss before leaning down to kiss you passionately while her pussy muscles squeezes your shaft.

Animalistically you want to fuck her until you cum but you know that there are still three more women who wants to please you with their mouths and pussies.