"Okay let's"

"Let's what?" Karen asks, just as confused as you are.

"Guy sharing" Katie responds. "You want him for tonight?" The comment is met with silence. You study your girlfriend's face to see if she's serious. You imagine Karen is doing the same thing. "Look, I'm exhausted. I just threw the biggest party of my life." Katie says. "I had every plan to have a little fun in bed tonight, but I might just fall asleep mid screw. But you're right, he deserves it for his birthday."

Karen clears her throat. "I mean I was just joking, you know..."

"Were you though?" Katie says. "If I gave you 100% permission to have sex with him, wouldn't you?"

Karen doesn't answer.

So you decide to chime in. "How do you know I'd want to..."

"Oh please" Katie says, "Because I've seen the way you've been looking at her tonight." She gives you a smile that suggests she may be telling the truth about how she feels.

And she's not wrong. Your eyes have been wandering over to Karen throughout the night. She's just so amazing looking, hugged by that pencil skirt.

"Okay" Karen suddenly says, nodding her head, a genuine smile painting itself across her face. She turns to where you're sitting. "Okay?"

You study your girlfriend. You want to make sure this isn't a test or something. Not that Katie is that type of girlfriend. Then again, she's also never been the type to tell you to fuck someone else.

"I mean it hon," She says, "Go for it. Consider it a late birthday present."

"Okay" you say, nodding. You look over at Karen. She's sitting up straight, starting to unbutton her blouse.

"Do you want to stay and watch?" She asks your girlfriend?