All the characters in the story are at least 18 years old. Information on the protagonists' age can be found in chapter one.
I have received constructive criticism and encouragement from you in previous chapters. I appreciate it very much. More is welcome!
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Andrew wakes up too disoriented for his memories of last night to seem real. And the dreamlike quality of Sarah's warm, soft body nestled safely in his arms isn't helping either. The curves of their bodies fit so perfectly that it's as if they were made for each other this way, as if they were meant to stay like this forever: their legs entwined, their steady breath in the air interwoven, her petite frame spooned by his large one, one of his arms draping over her small waist and clasped to her breasts. It's all too good to be true.
As he fumbles for his phone under his pillow to check the time, Sarah lets out some small, inarticulate noises from the limbo between wakefulness and dreamy oblivion, stirring and shifting a bit in his arms, her hips rubbing against his hard cock. She is practically naked, her shirt unbuttoned all the way down and her skirt bunched up around her waist, the only thing that separates his achingly erect cock from her defenseless slit the thin layers of fabric of his trousers and boxers.
He is so fucking hard.
A blurry glance at the phone screen tells him it's six o'clock in the morning, nearly one hour before when he usually gets up, as confirmed by the total darkness outside the window. It must be because they both fell asleep too early last night. Vaguely remembering with dread that he has an exam in Philosophy today and hoping for some more rest, Andrew finds himself unable to drift back off to sleep no matter how hard he tries.
All he can think about is last night. Well, it's not like he actually thinks about it; it lodges itself inside his brain, pushing, shoving and cramming it full until there's no space for anything else. He would have been frightened if it didn't feel so good, and so unbelievably right.
Andrew doesn't know what it means and he doesn't want to. All he wants is her. Her frizzy blond hair on his pillow that she tries to tame and smoothen to no avail and that he is too shy to tell her he loves just as it is, her sweet scent that is so magically distinct from the pungent artificial smell of cosmetics of other girls only because it's hers, her gorgeous body that he had such power over and gave such pleasure to that he's sure it will always astound him that he actually did. There's no room left in his mind for the loose ends they left last night, or the cold, hostile big world looming out there that could easily tear apart everything they have between them. Just her. Sarah.
As it turns out, it's a very, very bad idea to allow his memory of last night to run wild with a naked Sarah pressed tightly against him. The more he remembers the view and the sensation of his cock wrapped in Sarah's pretty cherry-red lips and her warm, tight mouth, and those dovelike blue eyes of hers that gazed straight into his as she sucked him, the more unable he finds himself to contain the urge to rub his cock rhythmically against her naked hips. And it's only with Sarah's soft moans and the slight twisting of her body that he realizes what he's doing.
Andrew freezes, his heart thudding wildly in his chest. He can't allow himself to be an asshole who takes advantage of her while she is asleep, no matter how sure he is she would consent were she conscious. But before guilt can take shape, his mind is wiped clean by Sarah's slowly but surely taking his hand and pulling it across her naked front down to between her thighs, her fingers guiding his as he starts to tease and rub her clit. It is only then that he realizes she is dripping wet.
"Touch me, Andrew," she murmurs dreamily, "make me come."
He doesn't need her to say it a second time. There's something in him that has been changed forever by last night, and he knows that with certainty that still feels too raw and tremendous in its immediate aftermath. The ability to give and receive pleasure, to be as close as humanly possible, to peer into her eyes as she comes for him and cries out his name. It makes him almost feel like a grown-up. A man. And he wants to keep doing this to her, to keep producing the same effect on her over and over again, until - his mind grows hazy - until they cease to exist.
But all of this is really too much to process when she is gasping and squirming against him as his fingers find the right pressure on her swollen clit, kneading it in a circling motion he is gradually getting himself familiarized with and that he knows will push her so quickly and so close to the edge. There's a vague notion somewhere in his brain that they must keep quiet because Mom and Dad are getting up soon, and that he'd better make Sarah shut up because Jesus fucking Christ her little noises are so delicious and arousing that he wants to come against her this very second, but before he can cover her mouth with his free hand, he realizes it's he who needs to bite down on his bottom lip to keep himself from groaning at what she is doing. His sweet sister has begun to play with her own nipples with her left hand, while reaching down her right hand and starting to slide her fingers in and out of herself in time with the motion of his fingers on her clit. Quivering from so much stimulation all at the same time, she throws back her head, leans back harder against him and tightens her legs around his, her little moans of pleasure the most wondrous music to his ears. His cock is so hard that it hurts.
"Sarah," Andrew breathes, "what are you doing?"
"I love it when you touch me," she murmurs, "and I love touching myself...I want to come. Am I a bad girl, Andrew?"
How can there be an answer to this question?
"Tell me I'm a bad girl."
As Sarah looks over her shoulder back at him while continuing to touch herself, her eyes glistening in the morning glow, Andrew realizes something powerful and monstrous inside him is desperately seeking an outlet. He wants to do something to her, something so rough and vicious that it would hurt her and make her cry. He actually wants to make her cry. And he knows this is what she wants. To submit and give in, to be degraded and owned. This knowledge is awakening the dormant beast deep inside him, spurring it on, threatening to goad it into a bloodthirsty rampage.
"I've been very bad," turning her head back around, Sarah whispers helplessly, her breath more ragged and the grinding of her hips against his cock more eager as Andrew suddenly increases the pressure of his fingers on her clit purely because he can, "because good girls don't touch themselves or make their brother touch them as I do..." a moan escapes her lips as he bites down on the soft flesh of her neck, licking and suckling it, his breath hot on her perfect skin, "...they don't want their brother to fuck them. And I really want you to fuck me."