"I guess all we have to do is convince ourselves to subconsciously follow every change the other one suggests," you say. You mentally try to do just that, telling yourself you unconditionally accept anything your girlfriend says. "I think I've got it."
"Same," your girlfriend says. She gets up from the bed and moves in to lean on your arm. She looks at you longingly, but you see another look in her eyes that tells you she's picturing someone else in front of her.
"I don't think I ever told you this before, but I've got a little thing for surfer boys."
"Surfer boys?" you ask.
"You know, smooth skin...long hair...thin, lithe body..." She traces a line with her finger down your arm, which you notice is becoming leaner. You feel a tickle on your ears and realize your hair is growing. She looks back up at you and smiles, apparently liking what little change she can already see.
As you feel the subtle changes wash over you, you figure it's time to do the same for her. "For the record I love you just the way you are," you say. Her face turns sour. "Just had to cover my bases," you explain. "So, you're into thinner guys? I'm into smaller girls."
"Smaller, huh?" she says, trying to sound insulted, but you can tell it's a tease.
"Shorter, thinner, as you said more 'lithe,' flexible." As you describe her transformation, you start to fondle her hips. You pass a hand over her rear and feel it shrink just a tiny bit. Hair starts to fall over your eyes, but since you're looking downward at her you don't need to brush it away to see just yet.
"It's just as well, since I like big guys," she responds. "Especially those entering their prime. Say, twenty years old."
You grin. You don't have a problem with getting a little younger. The two of you begin to fondle each other as you slowly move toward the bed.
"Then I don't suppose you'd mind becoming eighteen again. That way we'll both be happy; you get your big hunky dude, I get my sweet little girl." As you continue groping each other, she stands on tip-toe to press her lips against yours. You collapse on the bed, falling on top of her, and begin to fondle her breasts. "A sweet little teen with modest, perky breasts." Beneath your massaging squeezes, you feel the full globes of your girlfriend shrinking down into firm B cups.
Your hair falls over her chest, shiny and smooth. You're a bit impressed by how beautiful it looks, and then look at your girlfriend's own raven-black hair. "My hair's longer than yours now," you say.
She strokes your tresses, which haven't stopped growing despite most of your other changes having completed. You're slightly taller than before, definitely thinner, but you feel more agile and powerful. "I like you with long hair," she coos. "It's soft."
"Your hair should be longer than mine, and softer."
"YOUR hair should be longer than mine," she says. "It makes you prettier by the minute."
You start to kiss her again, passionately. You stroke her silky smooth hair and feel it growing, pouring into your palm as you bury your face in hers. Your legs intertwine, locking you into your horizontal embrace. She grabs at your hair, pulling it down to keep you from lifting your head away from your lip-locking, as if you had any plans to do such a thing. It isn't long before your hair's growth creates enough slack to make her efforts meaningless.
"Such a cute button nose you have," you say to her, watching her nose pull into her face until there is but a dainty nub. "And little hands, cute shoulders, thin neck..." You kiss her cheek and move down to her neck. She presses her cheek against your forehead as you kiss her smooth, round shoulders.
She moans softly, clutching your hair and covering her face with it. You pull up for a minute, and realize now how much smaller she's gotten compared to you. She can't be more than five feet tall, while you've actually grown from before, past six feet. Your hair is spread out all over, intertwined with her black locks, both of which are still slowly snaking out from your heads.
"Long enough yet, babe?" you ask her.
"What do you think?" she says, grabbing your hair once more and pulling you back down on top of her chest. She pulls your shirt up, revealing a toned and glossy chest. She touches it gently with thin fingers while you pull the shirt off your head and through your several feet of gleaming sandy hair.
She unbuttons her blouse, noticing your attempt to untangle your hair from hers so it can get through the collar of your shirt. "Okay, I guess it can slow down."
"Yours too," you say. You can't tell it's length with it spread all over the two of you and the bed, but it's clearly long enough to play with all night. You feel the growth of your own hair subsiding, and feel just a tiny bit of relief. Making love in the tangles of tresses is exciting, but you'd rather not drown in it.
You see her throw off her bra and know it's time to start concentrating on the rest of her body. Perky A-cup breasts rest proudly on her chest. You want to nibble at them, but your girlfriend has begun unbuttoning your pants.
"I'd like to see if you've gotten taller in other places," she says slyly.