"Mm, you certainly look strong," she says. "Honestly, though, I don't know when you get time to work out when we hang out so often."
Katie stared at her, confused. "I don't work out, you know this."
"Oh, sure, you just grew these bad boys overnight." Tiff said, running her hands across her friend's stomach appreciatively. She loved feeling the smooth, toned skin beneath her fingertips, gently prodding and massaging the muscle. But then, Katie pulled away, watching her warily. Her shirt dropped back over her torso, only covering the top four abs of her defined six-pack, just a teasing glimpse of her athletic musculature.
"Tiff," she said slowly. "Do you really think I've had these muscles for a while?" Even now, she could feel her muscles stretching out, larger and longer. Her head rose up above Tiff's, reaching heights she never could before, as her limbs lengthened swelled with strength.
Tiff laughed. "Of course I do! You think I don't remember you months ago? You were stick-thin! But I watched you build up that muscle, bit by bit, and even though I knew it was happening, I could never work out where you were getting the time to, well, work out! I mean, look at you! You're a lot beyond the beanpole I knew."
"Does that mean I was always taller than you?" Katie asked cautiously.
"Duh!" came the reply.
Katie stumbled back, knocking against the chairs, and landed sitting on the table. Her muscles were still swelling, aching as they did, as she watched herself hit lithe, then athletic, then built. She could still feel Tiff's eyes drinking in her form hungrily. "Do you still need that massage? You're still looking quite tense," the smaller girl broached.
Katie couldn't even formulate a reply, staring at her reflection in the polished surface of the fridge across from her. Tiff took her silence as consent, and closed the gap, slipping her hands beneath Katie's shirt to rub over her rapidly widening lats, and the craggy landscape of her back. She was reaching bodybuilder levels of muscle, now, still amateurish, though the growth wasn't stopping. She knew she was reaching around the six-foot mark now, her feet growing closer and closer to the floor as they dangled off the side of the table. Her arms were thickening quickly, and she gave her bicep an experimental curl, watching as the muscle raised bigger than Tiff's head. Down below, her legs looked more like they'd belong in a forest, thick and strong as tree trunks.
Meanwhile, Tiff was enjoying herself, drinking in the scent of Katie's perfume as she massaged. The muscle was hard beneath her hands, unwilling to yield to her ministrations. Her arms wrapped around Katie to walk across her eight cobblestone abs. Katie's body was so wide now that she had to press herself in close, breasts against her larger friend's back, just to reach the grooves of her defined stomach. Even through her shirt, Tiff could feel the heat radiating from Katie's body, seeping deliciously into her front. Her nipples stiffened against Katie's back, though she doubted the Amazon would even notice with how small she was in comparison. Selfishly, she let her hands wander upwards to the shelf of Katie's pecs and fondle her proportionately small breasts, eliciting a moan from the large woman.
Finally, with a deep, shuddering breath out, Katie felt her changes come to an end. She detangled herself from Tiff's arms to get a better look at herself.
The first thing she noticed was her height. Well over six feet, Katie reckoned she'd be closer to 6'8 or 6'9. Her physique was intimidating, so wide she could barely fit through a door frame, and that was before she realised she'd have to duck through any door now. Her torso could have come straight out of a museum, so perfectly formed it was as though Michaelangelo himself had sculpted her. Each bicep looked like it could substitute for a pillow in size, dwarfing Tiff's head, though no softness remained on her titanic body. Her legs below were similarly built, like barrels stuffed beneath her skin. The only thing that had remained unchanged throughout was her face. Staring back was still the reflection of the baby-faced sixteen-year-old, the same face that had greeted her when she woke up, even if her body was as far from what she had been this morning as possible.
As her gaze slipped from her own reflection, she caught Tiff's eye, who was eying off her physique just as eagerly as she had. Though, there was not the same look of shock on her friend's face, no, Tiff didn't even seem surprised. She was just drinking it in and enjoying the sights. Katie cleared her throat, wetting her dry mouth. "Tiff," she began. "Have I always looked this way to you?"
Tiff cocked her head, for once looking her straight in the eye. "Of course, Kate," she said. "I don't remember you any other way."