Two days had passed with tiny Amanda in a box in his bedroom. In some ways it was like having a pet. He had to clean her box each day, feed her and play with her a little. He suspected that chasing her around the box with his finger wasn't much fun for her but he rationalized it as a way to ensure she had enough exercise. It wasn't as if he could "do" anything with her. Even though she had no clothing she was so small he couldn't even see any of her feminine features, much as he wanted to. She was too small to read a book and her voice was so high pitched and quiet (fortunately) that he could hardly have a conversation with her. He kept a radio in the box so that she would not die of boredom but otherwise there was very little he could do for her. Arnold knew the arrangement could not last, and very likely would end badly, but once started he had no idea how to end it.

Fortunately no one could trace her to him. Her disappearance would be a tragic mystery, heartbreaking for her family, of course, but no threat to him.

The doorbell rang. It was Katie! She had come!!

Katie Lungren had been his fantasy for years. She was an inch taller than he was, not pretty in a classic way, but with a distinctive presence and tough, though very feminine way of moving. She had been a tomboy when they were in grade school and excelled in gymnastics and tennis, but the curves that her body produced when she became a teenager made gymnastics impossible and her tennis matches too much of an attraction for spectators for her to compete confidently. She dropped out of all her athletics programs, and although she retained her muscular build, her reduced training caused her to gain weight, most of which settled in her bust, her thighs and her hips. This made her even more attractive to Arnold, who fantasized that the additional weight was all rock-hard, bulging muscle. Moreover, her sullen, angry demeanor, a result of normal teenage emotions, her unhappiness with her body and her resentment that its development had forced her out of the sports and the activities she liked best, only encouraged his fantasies of her as a powerful, even unstoppable female force.

He made sure his room was neat, that Amanda was hidden and that the gun was well-placed for when he needed it. Then he ran downstairs to let her in.

"Katie!" he said, somewhat breathless.

She looked down at him and nodded. "Yeah. So, what's this about? You said it's important."

"Yeah, well ... can you come upstairs? It's more comfortable in my room."

Katie looked around. "Where's your Mom?"

"She's working. She's not back until after dinner."

Katie sized Arnold up and decided if he tried anything she didn't like she could flatten him in five seconds. "Yeah, OK. I brought the math like you asked." She handed her homework to him. "Is it going to take you long?"

Arnold scanned it and shook his head. "Fifteen minutes maybe." He took the stairs two at a time, while Katie followed more slowly. "In here," he said, unnecessarily, as he entered his room. He sat on the bed and after looking around she sat on his desk chair. He couldn't believe she was here, in his room.

"You're, uh, kind of staring at me," Katie said, a little uncomfortable.

"Sorry ... it's just ... I can't believe you're here."

"Why? You asked me. You said you'd catch me up on my math. I'm way behind. And pretty lost too.". She looked at him and then looked away. "You're still staring at me."

"I ... Er ... Sorry!". Arnold blushed.

"It's making me a bit embarrassed." she added. "Maybe I should go."

Arnold stood up. "No! Don't go. Please!l. It's because I .um I like to look at you. I've ALWAYS liked to look at you.'

Katie blushed. "At me?". She looked down, seeing only the bulge at her waist and her thick thighs.

Arnold nodded. "Yeah. Really. You're, like, my ideal!" She laughed uncomfortably. "I mean it. You're ... so strong."

"Yeah. Well ... stronger than you!" she said.

Arnold nodded. "I know!"

Katie looked at him. "Yeah! I'm sure. But I hate my body now. I'm so out of shape." She laughed a bit bitterly. "I can't believe I'm talking about this with YOU!"

"You're not out of shape. Not really. But ... I can help you!"

"What? You mean you're not just a math whiz but also a personal trainer?" She looked more than skeptical.

"I can make you stronger, the strongest in the world!" he said, his excitement overcoming him. He pulled his gun out of its hiding place.

Katie stood up. "OK. That's it.," she said, shoving Arnold down and grabbing the gun from him. "Jeez! I'm so outta here!" She looked at the controls. "Muscle growth ... Height growth. Where's the button for making me invincible?"

"You can't ... actually the muscle growth, with enough exposure, makes it really hard to get hurt, at least where the muscle is. It's because they get so much bigger and much harder!"

"You're actually serious!". Arnold nodded. "Why would you do this? What's in it for you?" She looked into his eyes. "You'd want to look at me? Touch me?" Arnold blushed and looked down. "Cute. Creepy a little, but cute. OK. Let's see. Shoot!" She handed him the gun.

Arnold checked the settings, aimed and fired briefly. The ray hit Katie's waist.

"Oooh! What was ... Jesus!". Her shirt immediately tightened as her chest and shoulders grew. Her thick arms expanded, producing rounded biceps, and her legs widened. She hit her abs a couple of times. "Hey, they're harder. Gimme more!"

Arnold nodded. He shot again, three times as long as the first time.

"What a rush. Yeah!" Katie said. Her chest expanded first. Her bust pushed outward and higher and then her shoulders widened, stretching her shirt and making deep stress lines across the top. She held up her arms, eagerly awaiting the rays' effect on her arms. Although it took little more than a second to begin it felt much longer and she was already feeling the first pangs of disappointment when her arms briefly felt heavier as her muscles expanded and then feather-light as they hardened and strengthened.

Arnold stared open-mouthed as her biceps grew from impressive bulges to softballs and then melons. Katie glanced at Arnold. Something in his rapt gaze warmed her and made her whole body tingle. "Hey, you can touch them, if you want," she said casually. Arnold hesitated for a second and then put his hand around her right bicep, one on top and the other underneath, feeling it reverently. Katie let out a low, contented growl. "Harder," she said. "Touch it harder."

Arnold nodded and tried to push it in. "I ... I'm sorry, it's ... too hard ... for me," he said, looking down at his feet.

Katie put her hand on his chin and lifted it up so that he looked her in the eyes. "'Kiss it, then," she commanded. Arnold put his lips down. "No. Wait". She tightened her fist and her bicep swelled again. "Wait," she said and grit her teeth. She tensed harder, as hard as she could, and another peak appeared. "There!" she triumphantly. "NOW, do it"