Lydia just smiled a little playful smile and did not answer. You gently take one of her feet and pull it closer to the edge of the bed. Her whole body followed sliding on the slippery spandex. Lydia yelped in delight as her body was tickled by her soft comforter. She propped herself up on her elbows to watch you work.
"Don't go too fast, OK?" Lydia asked quietly. "Now that I know what is going on I want to see it happen."
You nod in agreement and proceed to wet her leg. You start at the knee right next to the seem that parts the spandex skin from regular flesh. Dabbing the water onto her leg you move from one leg to the other working in strips of about one inch wide. You dip the cloth in the bowl and smear more water around her leg. At first you do not see any change and you start to think int might not work.
Then as you pause, you see the spandex start to move. It spreads evenly, marching slowly down her shins. You can not actually see the change but you can see the motion of the fabric ever so slowly changing Lydia more and more. It is like seeing an arm being pushed through a tight sleeve slowly except in reverse as the fabric is taught. The seam, slightly beveled and sewn under, creeps down her legs binding the two limbs together. When it reaches the end of the damp skin it stops again and inch or two lower than it was before.
Lydia giggles a little. "It tickles," she explains to your look.
Wetting the cloth again you once more start the spandex moving down her shins. Her legs, bound below the knees now, no longer are able to move independently which makes getting between them more difficult. As her shins become more merged you see that the seams ring each leg and there is a small patch of spandex between them. You run you finger between her legs across that short span and Lydia kicks a little.
"Ooh," she says, "What are you touching? That felt weird."
"Just the space between your legs," you say. You then run your finger tips up the shallow valley of her new tail that is formed by the two bones underneath. Lydia was still very much human under the spandex for now. Your fingers follow the valley up her legs passed the two kneecaps and as far up her thighs as you can reach. Near her hips you see the fabric go flat and smooth as it wraps around her belly. Lydia squirms under your ticklish fingers and she smiles.
"Keep going," she pleads and you return to wetting her legs.
You dribble water down each leg to the ankle then stop. The spandex follows and merges her legs together until her feet are all that remain. They are pressed together, heel to heel, toes pointing away from each other about ninety degrees. You let her limb down to the floor and hold out your hand. She gives you hers and you pull her up to a standing position. Balancing her gently, she finds that she can stand but not move. Lydia twists and wiggles for all she can move with no legs, waiting patiently for you.
You step back and remove your shirt. It is clammy in the humid air and you are sweating. Hot from the your mad dash to be by Lydia and even hotter by her change. Lydia looks you over and smiles more broadly. With the damp cloth you take her arm and wet her hand and wrist. The spandex extends down her hand splitting and forming around each of her fingers separately. You both look at the perfectly formed glove that her hand has become. Lydia clenches her fist feeling the spandex fingers stretch and fold. She touches her arms and slides her hands over her changed body to feel the spandex slide about. Quickly you do the other hand as she soon has to blue hands.
Lydia touches your chest and rubs her hands on your bare skin. It is hard for you to reason that her skin is now spandex. You still think of her as having a layer of clothing over her body. A single garment that covers her from the high neck line, down her arms and binds her legs together in a full length skirt. It is seamless and zipper-less and hugs her so close that you can see every muscle on her body. Lydia's hands find your chin and she pulls you closer to kiss you. Your hands embrace her and trace the slick fabric of her back and ass. You find that the spandex has not yet formed into her cheeks and there is a tight stretch of fabric between them.
You continue to kiss her as you move your hands to her breasts. Her breasts that had grown as a part of the transformation to become large, round orbs that hung from her body in a way you had always dreamed about. Under your searching hands you feel them heave with her breath and become heavier as she exhales.
Lydia breaks the kiss to say, "I think they're still growing."
You look down to find that they are bigger now. Almost to the size that you had imagined so vividly when you asked the genie to do this. You can see two tiny nubs poking up under the spandex and you realize her nipples are becoming more distinct. Backing off you wet your hands in the bowl and smear the water over her breasts. Her royal-blue skin darkens slightly from the water as her breasts heave and grow. One, two, three more cup-sizes and now they appear to be the size of some hefty melons. Her nipples appear now coated in spandex and pointy and proud to be free. The two thin yellow stripes that star at her neck drop down toward her breasts then curve out to her arms at the top. They trace big circle around her breasts before curving inward to trace her waist. The effect makes it appear that she is thrusting her breasts out for inspection, which you happily oblige.
Lydia cups her huge breasts with her glove-like hands covering her nipples. "You can stare at them all you want later, but I still have feet to get rid of."
She promptly fell back onto the bed and lifted her feet up for you to catch.
"Hurry now, I don't want to wait anymore," Lydia said.