Who are you kidding? Of course you are!

Like Gwen said, she doesn't see her brother when she looks at you. So this definitely isn't going to make things at all awkward between you tomorrow. Besides, you're too horny to think about how you'll feel tomorrow anyway.

You climb into bed quickly, but apparently your nervousness is still quite apparent. Allison grabs your hand and squeezes it reassuringly as she settles into position. Gwen repeats the gesture with your other hand. "Shh... it's okay. Don't be scared. Big sis is right here." she coos, gently brushing a stray hair from your face. You haven't heard those words in years. Given the circumstances, the reminder of your shared childhood is hardly reassuring... but it is incredibly arousing. Between that and Allison's warm breath on your lower lips, you squirm and whimper in anticipation.

Your discomfort ends quickly when Allison finally stops teasing you and dives into your eager pussy. You weren't prepared for how good this would feel. For the first few moments, you forget Gwen is even there: there isn't room for anything in your mind but the sensations you're feeling.

Allison doesn't bother building up slowly, sensing just how worked up you already are, but instead assaults your folds relentlessly. Her tongue alternates between swift jabs, long strokes, lazy circles and flicks on your sensitive nub so fast that the sensations all blend together in a haze of ecstasy. On top of that, she's managed to reach her hands up to continue her earlier treatment of your breasts. If last night was your first restaurant meal, this is your first dessert, your first beer, and your first joint all rolled into one. You've never been anywhere near this high. Then, when you think it can't possibly get any better, you feel her wet lips close around your swollen nipple...

Wait... that can't be right! You open your eyes to see that in fact, it's Gwen's mouth and hands you've been feeling on your breasts. What the hell?! Sensing your sudden movement, Gwen looks up at you and flashes you a naughty smile. You frown back at her. Or at least, you try to; you don't exactly have full control of your facial expression at the moment. She apparently gets the message, though, as she removes herself from your breast... only to lean across your body and take the other into her mouth. A small orgasm shudders through you at the unexpected touch.

Gwen finally pulls away, giving you a clear view of Allison. She's staring at you, but it's hard to decipher her expression while her mouth is covered. You know she's trying to tell you something, though, because she's slowed down to keep you from cumming. Is she angry at you for letting Gwen do that? No. She looks expectant, like there's something she's hoping you'll do. You think you know what it is, and you'd hate to disappoint her.

As you turn and bring your arm around to cradle Gwen's head, you can tell she's hoping for the same thing. You pull her face to your own and run your lips across hers. You're far too distracted to kiss her properly. Instead you clumsily brush your lips and tongue against her, as if trying to discern the contours of her lips and mouth by touch alone. Then you give up on kissing and just stare into her eyes, your faces hovering alongside each other. You're close, and you can tell she is too. You feel an impulse to try to express just how perfect this moment is, but only a few words manage to find their way to your lips. The first is "Gwen", followed by "Allie", and then "fuck!" as the orgasm you've been waiting for finally crashes down on you.

Gwen came with you, you realize as you start to get your breathing under control. You wonder at the coincidence for a moment, until you notice Allison withdrawing a hand from her nether regions. She then proceeds to lick the fingers of said hand, pausing in between each one, doing her best impression of a critic comparing the flavors of two fine wines. All three of you share a laugh at that. Afterwards, Gwen is the first to speak: