Fiiiine, yuricest posting resuming after a lengthy hiatus and a change of account.
Your younger sister, from the time she was little little, had found no greater peace than sitting on your thigh while you bounced your leg. Your parents had been thrilled to see you not only take good care of her, but find a surefire way to calm her down during a tantrum. As she grew, the technique became less frequently necessary though still useful during periods of high stress. These tender moments of bringing your sister down from her fits became faded memories like the tears you used to watch dry on her cheeks. Rocked away by the the metronome of years.
Your parents' place was rarely quiet, especially when it was a day for "the kids to visit". Your dad's girlfriend loved her wireless speaker and the excuse to pop the cork on a bottle of wine. Meanwhile, your father would alternate between watching sports on the tv and cooking an early dinner. Neither you nor your sister could stand the combined noise, and were thankfully excused after only a few guilt-tripping statements about not wanting to spend time with the family.
So it was that you both found some peace in your old bedroom that was half-converted into a storage for items someone decided could not be left at one of many garage sales. Your bedframe, old, but sturdy, creaked a 'welcome home' to you as you sat down on the mattress atop it. A murmured echo resounded as your sister joined you, making two pairs of legs hanging over the side, half a meter apart, feet resting on the floor. You let out the first big sigh. She did the same shortly after. It had always been like this to some degree: you both enjoyed each other's quiet company more than the bustle of larger groups. Naturally, you assumed that was why she had closed the door behind her after following you in. It didn't deafen the noise from outside the room so much as dampen it.
You asked her about classes, how things were going. Your sister paused before answering that things were mostly fine. Nothing exciting. You watched her as she spoke, noticed the slight tremble in her voice and the dark rings under her eyes. Something was clearly bothering her, but you weren't sure if pursuing an answer to what it was would be helpful for her. The younger sibling continued without you prompting her thankfully. She had been struggling with some of the harder classes. Really struggling. The tears she had been restraining leaked rebelliously from the corners of her eyes as she vented to you.
Her face crinkling up and turning a flushed red caused a simultaneous wave of nostalgia and hurt to wash over you. Almost by reflex, you closed the distance to hug your sister, willing the stress to leave her in your embrace. Shaky hands, grabbed at your sleeves, timidly at first then securing a hold on the fabric and your arm beneath it. She leaned into you and cried wordlessly. How long had she been bottling up?
You remained there for a while, though the actual duration went unnoticed by either of you. A fragile voice came muffled from your shirt asking hesitantly if you would do a favor. Anything for your lil sis, you replied, figuring it would be a "don't tell dad" or "could you get me some water". The actual request left you stuttering for a second: a little time on your lap, like you used to give her when she was a kid. You jokingly remarked on how she was too big for that and that it might be a little awkward with you both being adults. She withdrew from your hug in response and a spark of anxiety crackled in your chest. Big, wet, eyes stared up at you and a single "please?" was whimpered, stealing away any rejection.
You had to put some effort into maneuvering her into a comfortable spot on your thighs -- it felt like was letting you do most of the work to lift her rather than sitting herself down. Just like you used to have to do... except heavier. Keeping up with exercise had paid off, you mused in the back of your mind. Situated, you wrapped your arms around your little sister. Evidently, it wasn't satisfactory, as you heard her request in a soft, expectant, and higher-pitched than usual voice, "bouncies?" Well, you've done this before, haven't you, big sis, you thought to yourself. She was acting so childish right now it was -- rather should be -- disconcerting.
But you didn't feel that, as you flexed your lower leg and foot muscles rhythmically. Just comfort. Here she was, your kid sister again, the fussy lil thing you remember from all that time ago. Even the quiet hums that came out choppily were the same. Needed this, huh kiddo? you asked. An already-relaxed mhmm came in response.
There was a problem quickly arising despite the comforting actions, which you noticed with shame. Your sister's butt was squishing on your lap in such a way that provoked unwelcome thoughts and an unwanted reaction between your legs. Easy there big sis. Especially not when she's acting like this. Not at all, preferably. You hesitated for a moment, pausing the up and down movements, but were hit with an immediate, disgruntled "mm-mmm >:(". Spoiled princess wanted her bouncey time. Maybe she wouldn't notice? Or better yet you could a handle on your girldick so you didn't prod your younger sister's ass with it during what was supposed to be a wholesome act of comfort...
Stars above she smelled nice though, her light brown, curly hair centimeters from your face. If you weren't related you could definitely see this going... no, stop, gross. Plus she was acting like a child. Don't perv on your sister, don't perv on your sister while she's age regressing! A slew of self-directed insults peppered your mind, but didn't deter the growing warmth in your core. How much of that was exertion from bouncing a grown woman on your lap and how much was from guilty arousal was hard to tell.
Okay, break time for real, big sis is getting tired, you tried to convince her with a partial truth. The other half of the reason was close to making a small tent at the front seam of your pants. A second annoyed noise met your ears. You imagined your sister's face in a pout -- you couldn't confirm with her seated facing away. As an act of protest, she lifted herself up slightly under her own strength, then dropped again into your lap. A reversal of the bouncing you had been doing that surprised you enough to cause your breath to hitch. Heat began clouding your mind, removing inhibitions with frightening ease. You barely noticed her shift to straddling just one leg instead both as you fought off the incoming tide of arousal. And then she did it again with an addition that sent electricity through you: a little moan escaped her throat.
There was no stopping your hard-on from pressing into the curve of your sister's butt then, greedily pushing against the confining fabric to get every bit of contact. This is so so so wrong, so why the fuck am I this turned on, your mind desperately tried and failed to outpace the lust. Another bounce, this one ending with a bit of grinding. The heat coming through her panties was noticeable. And still not a word out of her, just grunts and moans. It was driving you wild.
Your hands closed on both sides her waist, all pretense falling free like shredded paper. Her ass was pulled backwards until it met your waist, the length of your cock pressing into her from below. "You want grown up bouncies?" you all but growled towards her. A shiver ran along the length of her body, and she nodded. Break time was over then, you concluded. Time to make a mistake.
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