Something weird starts to happen as you look at your feminized hands: you realise you like how they look and feel. Smooth, petite, hairless. You notice you're getting a bit of an erection. But not wanting to touch it for now, you instead put the shampoo on your face. It tingles and you notice your stubble recede into your skin, which feels softer, and your jawline seems less sharp. Even your face and neck's proportions seem to have changed now.
You move the shampoo into your shoulders and feel them slink inwards, and your arms slim down and seem less muscled. Looking down you notice your nipples have turned erect, as if begging to go next, and so you rub it into them. Your breathing quickens as you touch your chest, which is giving you sensations you've never been able to feel before. It seems to soften while your nipples harden, and all of it turns devoid of hair. They swell and expand into sensitive nubs, and the flesh around them enlarges into soft breasts. Paradoxically, your erection feels even more intensely aroused in response.
Putting some more shampoo on your hands once you can tear them away from your new boobs, you decide to change the rest of your lower body before your crotch. You run your hands down your torso and feel it shrink and curve inwards, and when you reach your hips they widen under your touch and your ass fills out. Next you move to wash your legs, and their hair practically washes off while their muscles soften and turn smaller, your feet following suit and getting more petite like your hands.
By now just one part of you doesn't look feminine- the large erection sticking out between your legs. You take a deep breath, get one last squirt of shampoo and rub it into your penis. It feels more arousing than anything you've ever done in your life, and instinctually your other hand goes to one of your boobs and cups it, pinching the nipple.
You moan loudly and cum hard, seeing jet after jet of your cum shoot from you and down the shower's plughole. By the time you stop, you feel like you've been milked dry, and moments later your balls seem to move up inside you while your shaft shrinks away.
Seeing the protrusion between your legs vanish and feeling the shifting sensations inside your crotch makes it sink in: you're not a man anymore, you're a woman now. You feel a near-orgasmic relief as your penis finishes receding into your clitoris and your scrotum opens out into your vagina, the enormity of the change sinking in.
Once you come down from the high, you pick up your swimsuit. You hardly notice that it's now a ladies' one piece instead of men's trunks until you pull it on, and once you do you're just grateful it covers you as you make your way to the pool.