"Let's demonstrate the proper use for a pool."

As you say the words, you begin emanating pheromones as intensely as you can. Hannah's nostrils flare slightly, her eyes flickering as she inhales. When her eyes return to yours, they are filled with carnal lust. Stretching like a cat, she pulls off her coach's uniform, revealing her curvy, athletic body, hid only by a skimpy bikini.

With a grin, she prowls around to where the girls are chatting, the final swimmer grabbing the side with resignation.

"Well done," announces Hannah. "Now, all of you make a big semicircle by the side of the pool. Michael and I are going to give you a demonstration."

Heart pounding, you follow the older girl as she effortlessly slides into the water, and look around at the dozen or so pretty faces watching expectantly.

"Now, watch carefully everyone," continues Hannah, catching your eye with a predatory smile. "If you're lucky, you might get the chance to do this too."

Suddenly she wraps her arms around you and presses her lips to yours, kissing you deeply as her toned body rubs against you.

"M-Miss Hannah?" asks Emilia uncertainly. "What are you doing?"

The brunette's eyes fly open and meet yours, but she doesn't answer her student, just leaning further over you as her hand slides down your back. As you feel your erection rising in the water, you sense the potency of your pheromones ramping up, diffusing through the water and air to the girls watching on in shock.

Hannah pulls down your shorts, freeing your cock, and you easily kick off the fabric.

"Hmm," whispers Hannah in your ear, her fingers stroking your base. "I'd better show them how to deal with a big dick like yours..."

Your breath catches as she trails her lips down your wet body, submerging herself as she passes your diaphragm, until her hands are cupping your bum cheeks and her lips slide over your head. As she begins to blow you underwater, you toss your head back, weaving your hands into her weightless locks as you press her further down your shaft. The feeling is amazing, her talented tongue caressing your length with unparalleled technique.

You open your eyes and glance around, to see that the shocked expressions have been replaced with rapture. Several of the girls are rubbing themselves vigorously under their swimsuits as they watch their instructor at work.

Suddenly Hannah bursts out of the water, taking a gasping breath.

"Martha," she says. "Get us a large float. Quickly." She rubs her breasts against your body, smoothly stroking your cock underwater with one hand, her eyes fixed adoringly on your face.

Martha - a tall girl with a swimmer's physique - soon returns, with the largest float available. With a grin, Hannah tears herself off you, stripping in front of her students and rolling to lie face-up on the float. She beckons you with a twitch of her elegant fingers, and you eagerly comply, climbing atop her. You feel your way up her soft ankles, supple legs, frictionless stomach, spherical tits, until your lips meet hers in a loving kiss. The float sinks beneath your combined weight, until you are half-submerged. Unless she lifts her head, Hannah is completely under.

Lining up your meat with her hole, you ravenously thrust deep into your hot crush. Hannah's insides part before you easily, but still feel tight around your thick girth. She gasps into your kiss, a few stray bubbles rolling up your cheeks to the surface. Squeezing her to you, you begin rucking wildly into her, consumed by pleasure. You don't know where your body ends and hers begins, as you desperately thrust yourself into her, sliding off the float to writhe freely in the water.

After only a couple of minutes, however, Hannah's lips clamp down on yours and her pussy clenches as she cums, frantically trying to finish before she runs out of air. As her nails dig into your back, you finally release, pumping hot cum into her spasming cunt.

You break the water with Hannah's naked form in your arms, frozen in a moment of uncontained ecstasy.

"Hannah, you will always be devoted to me," you pant. "And you'll always love giving amazing underwater sex. You'll have perfect hearing and vision underwater, and even be able to breathe and talk underwater. Everyone knows you're hottest when you're absolutely soaked, so your body will always be naturally covered in water, your skin glistening and your hair sodden. Whenever I say 'freeze', you'll return to this state. Now unfreeze."

Hannah's eyes fly open as she shudders, finally finishing her huge orgasm. For a few seconds, she floats motionless in the water, smiling dumbly at the ceiling. Then she catches sight of you, and presses her body to yours.

"Hey baby," she giggles, nestling her head on your shoulders. "I think that went pretty well."

"I'll say," you murmur, stroking down her wet cheek, over her elegant jawline. When you feel her neck, however, you find several flaps of skin moulded into her creamy neck. Gills.

"You like them, Michael?" Hannah coos. "Oh, yes, keep stroking them, keep fondling them... it feels so good..."

"Enough already!" Sasha's voice distracts you from the gorgeous woman at your side. You look up to see all sense of decency from your peers has gone - only a few still have their swimsuits hanging off them, and all are masturbating right there in the pool. Several of them have followed Amy's lead and are openly finger-fucking themselves.

"She's good, I'll give her that, but I bet I can do better," continues Sasha, smirking as she saunters towards you. Her globular breasts bounce together in the water, her blonde hair plastered to her creamy shoulders. "C'mon Michael," she moans. "Let me show these losers how it's done."