Bored Little Girl/Pool1a
You grab a dark purple one-piece suit. For a while this had been your favourite bathing suit, until you decided to start wearing more revealing two-pieces. Still, today you decide that you want to wear this one again for a change. As you pull it up over your shoulders, you realize you've grown quite a bit since the last time you wore it. It was normally a very modest suit, but now just standing up straight made the bottom pull tight against your pussy, and with the slick dampness between your lips lubricating it, it slipped easily between your outer lips, putting an arousing pressure on your clit and inner labia.
You take a quick look at yourself in the mirror, enjoying how your frontal wedgie just draws attention to your privates. You also notice your nipples have gotten hard and can be seen through the fabric of your suit. You smile devilishly and run down the stairs and out the back door to your pool where Jackie waits for you, putting one leg up on a deck chair to apply sunscreen. She chose to wear a light yellow bikini with tied sides. The tiny triangle at the back offered a great view of her butt and you could faintly make out the outline of her puffy areolae trough the thin fabric of the top. Your pussy had already started to make a mess of your wedged gusset in the time it took you to get down here, and seeing so much of your sister's body was only speeding that up.
"Wow, sis!" exclaims your Jackie when she sees what you're wearing. "Isn't that suit a bit small?"
"A little, I guess", you reply, quickly moving to get into the pool before your pussy juice started dripping down your legs and revealing how aroused you were. "But it was the first one I grabbed and I just wanted to get in the pool quickly. It's fine."
"But isn't it uncomfortable how it's pulled up into your... Y'know..." Jackie smiled awkwardly as she pointed her I did fingers downwards, too embarrassed to talk about her sister's vulva directly but curious enough that she had to ask.
With your aroused girly bits now hidden below the water, you gently slide a finger between your lips and over the fabric squished between them. "No. I actually think it feels kinda nice", you say, smiling innocently.
"Really..." replies your sister inquisitively, but says no more as she walks across the deck to the pool shed, retrieving an old boombox to plug her phone into, presumably to play more of her boy bands. Of all the changes that adolescence had brought to you sister in recent years, her appreciation for autotuned teenage boys was your least favorite. Meanwhile, you wade your way along the wall of the pool to the reason you wanted to come out here in the first place; as you pass your aching pussy in front of the flowing return jet, a wave of pleasure washes over you and you let yourself moan, knowing your sister is out of earshot in the shed.
You had discovered masturbating with the pool jets a couple years ago. At first, pointing the jet between your legs was just something you knew felt good, and you did it from time to time whenever you were swimming, but never for more than a second at a time. But as you experimented with it more, you found out how to tease yourself with it and build up pleasure until you reached a wonderful climax. You put that experience to work now, slowly swaying your hips back and forth in front of the jet, letting the flowing water pass over your swollen lips. You close your eyes and want to make yourself cum right away, but the bang of the shed door alerts you that your sister is back out on the deck.
You compose yourself and casually paddle across the pool as your sister grabs her phone and fiddles with the speakers. Your lips are so swollen and sensitive that just paddling your legs is bringing you closer to orgasm, and by the time you reach the other side of the pool you have to stop. You hold onto the wall of the pool as your breathing slows back down. You sister is luckily not paying attention to you, having just found the song she wanted and now starting to dance her way to the pool stairs.
Jackie quickly submerges after walking down the stairs coming up right next to you and surprising you with a splash. You hadn't actually put your head under the water yet, so the water hitting your face was a shock and for a moment you were more focused on splashing your sister back than bringing yourself to orgasm. The moment passes, though, and Jackie begins drifting in lazy laps around the pool. You wish you could just set up in front of a jet and cum at this point, but your sister would definitely notice, so for the moment you just circle the pool like your sister, casually bringing your pussy in front of each jet you passed to inch you closer to orgasm. The slow build is torture. Eventually...