Send Katie in

"You can go" You say, a reaction that surprises Katie a bit.

"What, would you prefer to watch?" She asks, and you respond with a bit of a smile. You would prefer to watch, just for a bit. You'd prefer to see the look on Samantha's face when Katie tells her that the thing she's apparently been hoping for is about to happen. You nod. "Okay" Katie answers a bit incredulously. "But don't watch too long, or we might decide that three's a crowd." She says as she heads into the bedroom.

You know that she's kidding. But her point is well taken.

You watch as your girlfriend walks up to her best friend, naked in bed, who smiles as she approaches. Katie leans in and says something to Samantha. Samantha says something back. They're not exactly whispering, but they're talking low enough that you definitely can't make them out.

They laugh. They giggle.

Samantha glances toward the door, very quickly. Does she know that you're there? Does she know that you saw her? Do any of these details matter, considering the way this evening is turning out in your favor?

Samantha slides herself to the edge of the bed, sits up and spreads her legs. Katie kneels between them on the ground.

The two best friends are eye-level, inches from each other now, still giggling and mumbling to each-other as if they're speaking their own language.

And in a way they probably are. You know that they've known each other since before high school. That they've always been close. What things they must have experienced together in over a decade of friendship. And despite experimenting a bit in college, you wonder if they'd have predicted that their friendship would lead them here.

And because of you. Sure maybe it would have happened eventually. But right now, because of your birthday, because of you. And it is most definitely happening.

Sam paws at Katie's shirt, and Katie raises her arms, letting it be pulled over her head. She leans in and cups her friend's massive tits, so huge in the palm of her petite hand. And they kiss. It's a long, involved, passionate kiss. You're close enough that you can see their tongues tying in knots around each other's.

More giggling. They're very happy.

So are you.

Then Katie's frill covered, black lace bra is off as well. You didn't even quite see it happen. You wonder if she tore it off, or if Samantha did in a moment of passion.

And you decide it's time to heed Katie's warning, and start to strip down yourself. You pull your shirt off, and you slide your pants down, methodically. Not too eagerly. The last thing you want to do is fall through the door in a moment of unexpected clumsiness. But as you look down to step out of your pants you miss something, and a sound brings your attention back to the girls at the foot of your bed.