Call your sister in. To apologise to her. Yeah.

"Jenny, can you come in here?"

Opening the door, your sister bounces - it's the only word you can think of that fits - into the room, hitting the door shut with her ass as she does so. It's hard not to stare. In deference to you she's put on a pair of loose, black shorts, or at least they'd be loose on anyone else. Her tits jiggle as she pauses in front of you as you sit on your bed, and you watch idly as a nipple threatens to poke out over the low-cut tank top. You imagine the sight of her thick brown nipple poking up over her top, and you feel your cock bulge again.

You kick yourself mentally. Sure, this is just the natural reaction to a girl with a body like that, but this is your sister, you tell yourself. Your busty, round-assed, sexy little sister.....

You realise that your sister is looking down at you. Her mouth twists as she controls a laugh. "Sure I'm not interrupting anything?"

It doesn't mean anything to you until you follow her eyeline down, past your own breasts (you have to lean back a little to do it) and gasp. Your cock is straining against your jeans, pointing towards the sexpot in front of you.

Blushing hotly, you start to turn away, but quicker than you can think your sister has her own hand on your arm, holding you steady. You look up at her as she bends down to meet your eye level, a soft smile on her face. "Oh, Taylor, you know I don't mind... if you really wanted, I could even... help you out a little...."

Eyes wide, you begin to breathe a sigh of relief as she undoes her grip on your arm, only to yelp as her hand slides beneath your waistband and her own fingers start to slide along your cock. You try to wriggle backwards, but only succeed in sliding further towards her, and with a giggle your sister uses her free hand to swiftly unsnap your jeans and tug them down, your cock springing out in front of her smiling face. Your mind racing you reach to cover yourself, but with a wink at you she turns down and quickly, with obvious experience, she dives downwards onto you, her lips wrapping around your cock. From then on any idea you have of escape is long gone from your mind, and by the time Jenny's pulled your jeans completely off you're tearing your t-shirt off, too, lost in the pleasure of her mouth.

You're gently pushed back to lie on your bed, though for a moment you start sitting up again as your sister pulls off your cock with a pop. You look up, only to see her pulling off her top - her huge tits bouncing into place on her chest - and then immediately she's sucking you off again, her tongue running rings around your cock. Reaching up, you grab one of her breasts, and are immediately rewarded by Jenny's eyes fluttering back into her head and her moaning around your cock, the vibrations only serving to make you harder. You knead her tits with your hands. It's not like you're an expert at this, though ex-girlfriends have never complained, but you've never been faced with tits this large and perfect before. Flicking a nipple you watch as the ripe flesh around it jiggles, and your sister shudders along the length of her body. A tiny voice tries telling you what you're doing is wrong, that fucking your sister's mouth must just be something that's happening because of whatever's happening to everyone, but a thousand other voices drown it out, demanding more, compelling you to lift your hips to meet Jenny's talented lips, telling you how good it feels, a hot, wet slut going down on you while you play with her bouncing boobs -

It isn't long, naturally, before you cum, and Jenny's lips press themselves firmly against your cock, making sure nothing escapes, her cheeks bulging as she swallows your load. Finally, peeling herself free, she sits up, smiling down at you. A tiny dribble of your semen trails from the side of her mouth; as you watch, a drip falls from it, landing on her breast and leaving a short, milky trail down the vast slopes.

Whether it's exhaustion, your mind finally overcoming your dick, or something else, you feel tiredness come over you, and swiftly you're asleep.

When you wake again a few hours later, it takes you a while to understand why everything seems so off.

Then you look across to see your sister dozing peacefully beside you, a contented look on her face, and it all comes rushing back.

The fact that the memories only serve to get you partially hard again is swiftly ignored, and put down to you discovering, as you try to stealthily get out of bed, that your sister has her fingers wrapped around your dick possessively. With care, you slip out of your sister's hand, and trying hard to focus on feeling not turned on at all, carefully hopping out of bed.

Shivering a little, you look at your alarm clock while going through your cupboard for something to wear. Afternoon. At least you didn't fuck the day away, you tell yourself, cheeks reddening, planning for somewhere else to go partly to try and find out what's going on and partly so you don't keep finding yourself looking over at your sister's bared chest.

Maybe trying college would be a good idea - if people are going to gather anywhere, it'll be there, and they must have plans in place for.... well, not this, but... disaster, or something. You could always pick a friend's house. Someone far enough away that they might not have been affected by all this, but close enough to get to on foot.

You hear a tiny whimper, and turn back to the bed. Your sister's face is screwed up cutely; it seems like she's missing your hand on her, and even in sleep the bulge in the blanket that shows her own slides between her legs and starts moving against her. Against your will you start to feel your cock rising again, and it's all you can do to try not to drop the clothes you've gathered together and put it to use again.

You could always rejoin her on the bed, of course. You can think of a few fun ways to wake her up.