You had to move out when your sister started HRT. The guilt ate at you; after all, you'd been through it all before, you love her, you wanted to support her. But the way she looked at you was too dangerous. So innocent. So helpless. Always coming to you with every little question, always excited to show off every little change, always so desperately and shamelessly looking up to her beloved big sis for approval.
It made you want to fuck her changing body until she never forgot who she belonged to. Every time she smiled up at you you wanted to shove your thick girl cock between those soft and pretty lips, and every time she turned away it took every ounce of your restraint to not rape her in your childhood home.
So, you moved out. Took a job across the country before you could do something you could never take back. She had another three years of college left so you knew she couldn't follow you, and you kept every message between you as short as you could. Which would be a lot easier if she would just stop sending pictures of herself dressed like... that. You could swear every outfit was two sizes too small, flaunting her newly soft skin and ever growing curves.
Every day became an endless cycle of resisting her and giving in to her. You worked almost constantly just to keep your mind off her, and came home exhausted to shamefully beat your dick to yet another set of new pictures from your little sis. Bit by bit she dropped any facade of modesty. Too-tight clothes gave way to lingerie and bare skin, playful innuendo became shameless, sultry begging for you. And still you persevered. You are not a girl of half-measures; if you claimed your sister she would be yours and yours alone, her entire life and future subsumed into your incestuous, inexhaustible desire. You love her. Could you really take everything from her like that?
Days blended together in a haze of lust and work until you lost track, weeks, then months, then years slipping by, until a single knock on your door breaks the cycle.
And there she is. More beautiful than every fantasy you've had about her, even exhausted as she is from her graduation and the long drive to see you. Her expression is the same desire for approval that you so vividly remember, and in her hands she holds a collar with more promise than any wedding ring. Your mouth is dry as you slowly reach out to take it from her.
"Are you sure?" you whisper.
"I love you," she replies.
Your hands are steady as you cinch the collar round her neck, and with your soft fingers on her throat pull her close to kiss the lips you've always dreamed about. You wish you could say that your new love was gentle and sweet, but that kiss was the last moment of tenderness your little sister would get for months. You'll make her pay for every single moment you held back. You drive her to her knees there in front of your door and grip her hair with hand while the other lifts your tenting skirt. She barely has a moment to gasp at the size of her big sisters cock before you force it past her soft lips, fucking her throat until it chokes her to the brink of consciousness without a care for what the neighbors might see.
The only thing that stops you is the moment you feel you're about to cum; you pull out, a string of spit and precum linking your incestuous cock to your sweet little sisters mouth, and drag her by her collar ring to your bed. You toss her onto the soft covers before getting a rope from your closet, tying her up to make sure she can't escape as you consumate your marriage here. You smear lube across your throbbing cock, pumping it to the sight of your cute little sister's gasping, shivering body, watching as she spreads her legs for you to reveal her own little throbbing girl dick and her tight, virgin hole. You've spilled gallons of cum to your sister in this bed, but tonight, as your cock pushes into your new toy and wife for the first time, as she moans louder with every inch you press inside her, you know every single drop of your load will be used for what it was always meant for; breeding your little sister. A dim voice at the back of your mind tries to tell you that's not possible, but all you hear is an excuse to fill her cute little body up as many times as it takes to knock her up.
You fuck her into the soft mattress, banging the headboard against the wall each time you slam into her until her sweet voice screams with pleasure, her cute little cock spilling her load across her soft body as you growl with animalistic lust and flood her deep inside with your cum. You never stop, fucking your load into her even as your fingers grip bruises onto her hip, pounding into her to shape her body to yours.
By the time morning comes you're finally exhausted enough to slow down, to wipe the mix of sweat and cum from her now unconscious body until she looks absolutely perfect. You set up a little camera, hold her close, and kiss her gently as it takes this picture of your wedding night.
You'll never let her go again.
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