Tell her yourself

"I think I'll go and let her know." You say, feeling proud and excited about this development.

"Good" Katie answers, and for a moment it seems odd that she'd be happy about being left behind. But she shrugs and clarifies. "Well, I think I'd like to watch for a bit. I mean... I've never seen you have sex... you know... from this distance."

She has a point. One that reveals a kinkier side of her than you'd have expected. Although there was that one time she wanted to record your love making and watch it later. Why didn't you agree to that again? What was wrong with you that day?

No use regretting the past. You head into your bedroom.

For a split second you're self conscious about the massive bulge in your pants. It just seems odd to be walking to another girl, knowing she'll see it, knowing she should see it.

Samantha takes a long, nude, stretch on your bed. Her body lengthens out and you can see a trim patch of curly red hair at her pussy. She opens her eyes and sees you approach.

"Hi" she says simply, with a smile.

"Hi" you answer back. You wonder if this whole thing seems awkward. This isn't going to have the perfectly choreographed plotting of a porn scene. And knowing that makes it seem more charming. It makes it seem real.

This is real.

You take a seat on the corner of the bed, next to your girlfriend's naked best friend.

"Is she watching?" Samantha whispers, somehow knowing what's happening. Then again, what else would Katie be doing right now?

"Yes" You whisper back.

"Is this a happy birthday for you?" She asks.

You nod. "It's not too bad." Your hand falls on Samantha's hip. Her flesh is soft. Goosebumps appear beneath your fingertips. And slowly you run them up the side of her body, up past her waist, past the side of her breast, into her armpit and up onto her arm and shoulder. Then you glide them back.

Katie loves when you do this to her. You wonder how she feels about watching you do it to her best friend.

Samantha moans. Your fingers caress her flesh. The swipe over her freckles.

"Would she mind if you kissed me?" Samantha whispers. You take in her lovely pink lips. Her whole body is lovely. You haven't really had a chance to take it in despite being right next to it. You're still trying to accept that this is happening.

"If she would, she probably shouldn't have sent me in here." you answer, stating the obvious. You glance over at the door. You can't make out much behind the sliver of an opening. But you're pretty sure you can see more naked flesh than you left there.

Samantha closes her eyes waiting for her kiss.