Crawling over

You'd be filled with disbelief if you had any more disbelief to spare. Instead you find yourself thinking, of course Kate is crawling over to the two of you on all fours. And within seconds she's at your feet. She makes eye contact and gives you a proud smile.

She should be. This really is the best birthday present a guy could get.

She glances up and down her sister's nude back, and whole body as it bounces on your cock. "I needed a better view" She says as she shrugs, as if to suggestion, who wouldn't want a better view?

Greenie slows her bouncing for a moment. You wonder if her sister's voice, just behind her takes her by surprise. You wonder how she feels about her sister saying that she wants a better view of her twat as your body penetrates it. You think that this moment is surreal for you. You can't even imagine what it might feel like for these sisters.

But if Tess is bothered by it, she certainly doesn't show it. "You want a better view?" Slowly she slips her body up off your cock. You use the opportunity to quickly unbutton your jeans, and pull them and your boxers down off your legs. Katie helps yank them off your feet. Not that fucking Tess through your zipper wasn't perfectly acceptable, but this feels so much better.

And Tess flips herself around to face her sister, exposing every inch of her nude, sweaty body. Her erect nipples. Her wet pussy. "Sure, we can give you a better view." And then Tess lowers her body on you again. She stretches her arms out behind her, and you take a hold of them, arching her back as she starts to bounce on your cock in a reversed position, making sure her sister sees the scene in all it's glory.

Katie just watches. You study your girlfriend's face as she stares at your cock penetrating her sister. You're so hard. You breathe deeply. The room smells like sex. And you know that Katie can not only see you fucking, hear you moaning but smell the two of you fucking.

And then she says something that doesn't compute at first. "I'm sorry..." though makes a bit more sense when she keeps talking. "I'm sorry Tess. I know we agreed that I'd just watch. But I don't think I can just watch."

What conversations the two of them must have had, planning out this epic night. Sure it would make sense that the rule would be that Katie just watches. But it also makes sense that at this moment that's a very impractical rule.

"Do you mind?" She asks.

You hope she doesn't. "Under one... condition" Greenie answers under long breaths.