Nope, It's Your Sister

"YOU PROMISED!"

Before you can ask what it was you promised, or suggest that you be given a second to find clothes, or even remember that you are naked in the first place, into the room stomps the girl from the portraits, barely more dressed than you are in a flimsy nightie and all grown up. And good GOD, she has grown up.

There's no mistaking it's her; there's the flowing mane of lush pale pink hair for one. She has the same adorably pretty face with the same button nose and rather plump lips, aged from a cute tween to a gorgeous young lady. She's even flushed the same way, though it's currently in anger rather than embarrassment as she scrunches her face up in a way that she may think is aggressive, but only makes her resemble a feisty bunny rabbit. She's still a dainty little thing...essentially. She a full head shorter than you with graceful limbs that she currently throws about in her fit of rage. That is where the daintiness ends; the years have given her the pertest peach of a bubble butt you have ever seen, wobbling off of her beautifully rounded hips but clearly tight enough to bounce anything you'd like off of it. And those breasts. Good Lord those breasts. Her nightie, clearly a few growth spurts behind the times, struggles laboriously to contain one of the biggest racks you've ever seen as the girl stomps her feet, sending her boobs quivering every which way. They're even still perky; they must be growing so much, so fast that they don't have time to sag.

All in all, it looks like Puberty finished up with the cute little girl in those portraits, checked its watch, and then said "You know what, fuck it. It's Friday; let's just give her the whole bag's worth and call it a half day." This is his...YOUR...sister?!

A beautifully manicured finger in your face snaps you out of your pondering over the scientific properties of your sisters tits and back to what you are **** to conclude is reality. "Issa is my favorite handmaid! You know she's my favorite handmaid, you know it!"

Eyes blinking, you quickly raise your hands to ward off the utterly ineffectual hail of blows she begins raining down on your chest. "Hey, wait; what is- "

She cuts you off, her voice (and boobs) quavering as she tries to sniff back tears and still sound angry at you. "I told you you aren't allowed to sleep with Issa! We talked about it! If you," she hiccups, "k-knock her up like you did Dehlia she has to go the nursery for months and I'll be lonely!"

Now deep in the middle of a legitimate hiccuping fit, she attempts to rear back and rain more bunnyish blows upon you. But you find yourself catching her firmly yet gently by the wrists, looking deep into her big, trembling green eyes. "Hey wait; wait! I don't know where," (or who), "Issa is, okay? And you know I wouldn't break a promise to you, don't you?"

You hope she knows that, because you aren't exactly sure on that score yourself. She stares at you for a moment, sniffing and hiccuping in turn, before she begins to bawl and throws herself into your arms. You let out a strangled noise as her giant breasts smoosh into your bare chest, and you remember that you are in fact totally naked. The girl hasn't noticed yet herself as she sobs prettily, rubbing her cheek and tits into your broad chest. "I'm s-s-sorry I yelled at youu!" she bawls, only calming down when you shakily raise a hand and begin to run it soothingly through her long pink hair. She begins hiccuping less and less as you comfort her, and at length she breathes out a little coo of contentment as she snuggles into your chest. Then, she suddenly stiffens.

Whelp. She realized you're naked.

The overripe little princess wrenches herself back, throwing her hands up to cover her mouth. In the process, her long-suffering nightie gives up the ghost and her glorious breasts burst forth in a truly spectacular display of size. Both of you simultaneously stare down at her proud breasts, wobbling indulgently as if they are on show, then both of you simultaneously look up to meet each others eyes. A moment passes, and then you both look down again as your dick decides it doesn't want to be left out of the fun, indolently yet inexorably stiffening and beginning to rise.

Neither of you can pry your eyes away as your cock makes its grand entrance, and you can't be sure but you think you even hear her let out a tiny gasp once it is totally horizontal. After what seems like an eternity, your penis is finally pointing demandingly at your sister's deliciously fat breasts, which for their part happily wobble as if accepting an invitation. There is an endless moment of silence, and then your sister bolts from the room.

"WELL IF YOU SEE ISSA TELL HER I'M, AH, GOODBYE SEE YOU AT BREAKFAST!"

You plop back onto the bed, hands grabbing at your hair again as your dick throbs resentfully at you. This. Is. Fucking. Insane. You don't even react when you hear a door crack open behind you, a light voice whispering out.

"Ah, is...she gone?"