Go to the local swimming pool

You say to your friends that you need to pee and start heading to the swimming pool. They shout over why aren't you going to the bushes and you reply I'd rather piss inside.

You reach the front desk and ask if you can use the toilet, they apologise and say that it's in the changing room so can only be used if you pay to go swimming.

You initially consider if it's worth paying but then you feel a small bit of pee come out of you and you immediately agree to pay.

You rush into the unisex changing room and into the toilet. You first stand to pee but quickly realise that won't work and sit down. As you release you feel the odd sensation of the pee almost falling out of you rather than shooting. It slightly turns you on but you resist masturbating with your sisters pussy.

You wipe yourself, pull up your panties and trousers then head out of the toilet. As you leave a 21 year old blonde woman walks past, she has a slim, short figure but you didn't get a chance to see much else. You notice that her swimsuit has fallen out the back of her bag and you are about to shout her as she leaves the changing room but then you realise that this could be your opportunity to try on a complete strangers body.

You grab it and walk into a changing booth.

You strip off, taking off your shoes and socks, pulling down your trousers and panties and lifting off your top. For the first time you are completely naked with your sisters vagina between your legs. It's kind of odd seeing your masculine body with something so delicate and feminine.

You grab the swim suit, slightly wet from when the woman who dropped it just used it. You slide it over your legs and as you do so you feel them become more soft and delicate. Your hair disappears and you start to shrink. You continue to pull it up. You get to your hips and you struggle to pull it up for a bit, the wet fabric gripping you. Eventually your hips and waist becomes more feminine and it allows you to get it up on over. It was strange as your hips were actually wider now than before but they fit the suit perfectly. Your waist had also tucked in starting to create an hourglass figure. Meanwhile your arse kept expanding and didn't seem to stop. You could feel it getting bigger and bigger, the swimsuit slowly ridding up until only a thin line was visible. Suddenly a cold ripple went through your whole body as it touched the side of the changing booth, forcing you to step forward slightly. You touch it and another ripple erupts through your body but this time of pleasure. Your arse was certainly big but was still perky and firm. You notice a heat radiate from between your legs. Despite already having your sisters vagina this one felt different. More sensitive. You reach down to stroke it and are met by something unusual, a metal piercing, you pull and play with it and you can feel your pussy get more and more excited. Soon your fingers are soaking and covered in vaginal juices, your knees are about to buckle but you resist the urge the climax before you are full transformed.

You grab the swimsuit and keep pulling up. As it passed over your torso you feel your body continue to shrink, you pass over your chest with ease as there's a lot of spare fabric and the reason for this excited you as you feel your pussy begin to warm again. You get the straps over your shoulders and you feel as they start to shrink into more proportionate sizes. Your arms, wrists and hands begin to thin and you can feel your fingers become more dainty and sensitive, suddenly everything felt super sensual to touch. As you inspected your hands, your chest began to balloon. B cup, C cup, DD, they kept going. Once they reacted double EE they started to slow but it wasn't until they reached FF that they finally stopped. They were big, not so big they looked completely impractical but big enough that they would be impossible to hide. You touch your now huge cleavage with your delicate, sensitive hands. They feel soft yet firm. As you look down at them you notice a blonde strand of hair drop down into your vision. Your transformation must be complete but without a mirror you couldn't see your face.

You notice that along the outline of your breasts there was two bar shaped objects, her nipples must have been pierced as well! You reach one hand in to grab it, your hand barely containing your boob and a wave of pleasure spread through your body.

Now you were fully transformed, it was time to explore your body fully.