Later that night...

The next thing you know, Nicole is shaking you awake.

"Babe? We're all packed up."

You stand up off the couch, and close your fly and redo your belt. You see that Sara has reapplied her makeup and packed her things. The girls have a pile of bags near the door. Two huge duffel bags, a backpack, a rolling suitcase, and a giant blue IKEA shopping bag that's filled with nothing but shoes.

Just the essentials.

You dutifully put the backpack on over one shoulder and lift both heavy duffels.

"Jesus, Sara. What've you got in these? Bricks?"

"It's just some clothes," came the reply.

"She wanted to bring more," said Nicole, as she grabbed the rolling suitcase and Sara took the bag of shoes.

You drive home. The girls talk about something or other. You just drive. Then you carry the bags into the apartment. Then you help Nicole get the spare bedroom set up for Sara. Then you brush your teeth. Then your head hits the pillow.

Hours later, you open your eyes. The faint glow clock on your bedside table reads 2:44AM.

You then realize what woke you up--you hear the familiar noise of Nicole's vibrator buzzing away under the covers to your right.

You turn your head and see your girlfriend, eyes closed, one hand playing with her tits and the other hand under the covers, working her vibrator across her clit. Her mouth opens and releases a sexy moan as she twists her nipple.

Watching her, you start to get hard.

You reach over and grab her wrist, pushing the vibrator away from her clit as you roll on top of her. Before her eyes can open in surprise, you're positioned between her long smooth legs. She locks eyes with you for a moment, the only light in the room coming from the bedside clock and she nods. You push inside her.

It's hot and wet and perfect, and you feel her folds welcome your cock. Her pussy grips you tightly with each thrust.

"Fuck me, John. Fucking fuck me. Fucking fuck me."

She locks her legs behind your back and starts pulling you even deeper as she talks.

"It was so fucking hot, the way you fucked my mouth and made me--fuck!--and made me swap your cum with Sara. I can't stop thinking about it. The way you just fucking used me to pass your cum to my sister, because it was her cum... oh fuck! Keep fucking me like that! Just like that! Just like that! Justlikethat! Justlikethatjustlikethatjustlikethat!"

Her whole body tenses and convulses as she orgasms. You can feel the walls of her pussy squeeze your cock as she cums.

"Fuck, baby, I'm gonna cum too," you tell her.

"In my mouth!" she says, scrambling to get her face to your dick.

She rolls you onto your back and gets her lips around the head of your cock just as you erupt. You grab onto her head and start fucking her mouth up and down your shaft as you cum--after all, she just said liked feeling used by you. When you finish, she jumps to her feet and runs out of the bedroom.

What the fuck?

You walk to the door and see Nicole run into Sara's room.

She's spitting your cum into Sara's mouth right now. They're probably making out again, their tongues passing your hot load between their lips until Sara swallows it down.

Your cock twitches at the thought. Then another thought hits you.

This is only the first night.

You climb into bed, and you're asleep before Nicole gets back.