Sweat is running down your big sisterās forehead and neck and arms in rivulets. Sheās panting, teeth bared in exertion as she wipes at her brow. Itās not an unfamiliar sight - she was always the one to push herself, go the extra mile, and win medals and trophies that adorn the bookshelf.
But you have never before seen her like that when sheās above you, the strap between her legs splitting you in two. You whimper particularly pathetically, and she grimaces above you, a hasty āsorryā under her breath. Her pace falters, and comes to a stuttering halt, but the silicone dick still trembles inside of you as her own hips buck and twitch involuntarily. The muffled hum of the vibrator buried inside of her is almost audible in the stillness. You whine, helpless and oversensitive and sore and powerless to do anything about it. Your sisterās eyes flutter closed, lips parting for a bone-deep moan she tries to keep down, and you feel something clench unbidden in your lower stomach at the sight.
āYouāre not done yet, are you?ā
Itās a question only in name, and you yelp at the startled, abrupt thrust. Over her shoulder, she glances at your mother who is standing at the doorway.
āMom-ā you start, but your big sister is faster:
āNo,ā she stammers, guiltily, āJustā¦ I needed a break.ā
Your mother hums, and walks up behind your big sister. Her hands come to rest on the girlās hips, idly tracing the harness as she looks down at you, her youngest, at your quivering, teary-eyed state, your wrists and ankles rubbed red by the rope and the sheets already soaked under your ass. An amused half-smile crosses her red-painted lips, and she looks at her oldest child again.
āOh, sure, you needed a break,ā she nods, and the embarrassed blush on your big sisterās cheeks gets deeper.
āā¦Mom, she looks really, really exhausted. What if itās too much-ā
āYou always try to go easy on her, honey. Itās adorable, reallyā¦ā she smiles, and gently brushes a sweaty lock of hair from your sisterās forehead, āBut this is for her own good, too.ā
She grabs the girl by her hips, her own pressed against your sisterās ass, and slowly, fluidly, she starts to guide your big sister into fucking you again. Every languid drag against your already tender walls has you whimpering and squirming in your restraints.
āYou are such a good daughter,ā your mother sighs against your sisterās neck, gently mouthing at her pulsepoint to distract her from your whining, āYou just need a bit of guidance. Encouragementā¦ā
The perfectly manicured hands ease their grip, as your mother lets only her hips quide your sisterās. She traces her eldest daughterās strong young body, until she finds the girlsās tits and starts to play with them, nails lightly tracing her nipples. Your sisterās soft, trembling moans are interspersed with the sounds you make and sounds of your bodies slapping together as she picks up the speed.
āGood girl,ā your mother hums, as she sees how her oldest daughter is fucking her youngest, vigorously and without hesitation. Your big sisterās pace doesnāt falter even when your mother grabs her by her hair and tilts her head to press a hungry kiss on her firstbornās lips. Your big sisterās eyes are rolling back in her head when the older woman starts sucking on her tongue, and you are clenching on the silicone cock as you watch with sweet, childish jealousy that mixes with the pleasure bordering on pain.
āGood girl,ā your mother repeats as she lets go of the girl who looks drunk on the older woman, āNow make me proud like you always do, hm?ā
Your big sister nods, and turns to look at you with that dazed expression on her face.
āSorry kiddo. You heard mom,ā she breathes out, not apologetic at all anymore when she grabs you by your thighs and starts to ram into you.
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