Why not both?

Grinning, you unbutton your pants.

"I think we have time to have a little fun before the party, don't we, Amy?"

The sexy blonde in front of you just smiles and lifts up the bottom of her short dress, revealing a black lace thong. She turns around and bends at the waist, looking back over her shoulder at you with a hungry look.

You step in behind her and pull her panties down, exposing her perfect dripping pussy. You step out of your jeans and drive your hard cock into your roommate's wet folds. She gasps out in pleasure.

"Yesssss, fuck me Jason. Ugh! Fuck me like a little slut. Your dick is so fucking good! So fucking good! So fucking good!"

Her newly-transformed pussy is so wet and tight, you feel your climax approaching.

"Oh fuck, baby, I'm gonna nut," you groan.

Amy suddenly pulls herself off your dick and pivots around to face you. She drops to her knees and roughly shoves her face forward until the head of your cock is jammed in the back of her hot throat. She pulls back and slams herself forward again and again, facefucking herself on your cock. She looks up at you with her blue eyes, pleading for you to cum in her mouth.

Your balls explode, sending a torrent of hot sperm into your roommate's slutty mouth. She lovingly slurps and licks up every loose string of cum and cleans your dick with her tongue and lips. Then she plants a slow kiss on the head of your cock and gently puts it back inside your boxers.

"If we're going to this party," she says, "I need to go fix my makeup!"

She skips to the bathroom, as you pull your jeans up.

"Well," you think, "if things with Margaux don't work out, at least I can still fuck Amy..."

Just then she emerges from the bathroom, looking like a million bucks.

"Hey stud," she breathes, as she wraps her arm around your waist. "How about we get to that party?"

You give her butt a quick slap, and open the door.