Amanda turned a few times, pushing herself up and down on her toes, rubbing her hands on her incredible muscles. Muscles now even bigger than her brother. And definitely harder. At least she thought so. It was difficult for her to squeeze them anyway, but she was also unsure of just how strong she was.

Pulling her right arm back up, she flexed her bicep, giggling as she watched the softball sized mass pop up and down generously as she flexed it.

Still enthralled with her new body, she barely heard her door start to open. And Brad starting to walk in. Amanda let out a surprised shriek and pulled her arms in front of her to cover her exposed breasts.

Brad froze from Amanda’s yell and stammered. Amanda furrowed her brow.

“What the hell do you think you’re doing? Don’t you know how to knock?”

Brad snickered, looking away.. “I just wanted to borrow your MP3 player. Randy and I were going to lift some weights.” He paused for a moment, but kept his gaze to his feet. “What are you doing anyway?”

Amanda growled. “None of your business! Now get out of here!”

Brad grumbled, but stepped back out, closing the door behind him. Amanda sighed. At least he didn’t mention anything about her muscles. Licking her lips, she looked at the gun. Randy, huh? She always had kind of crush on him, even though he was a year younger. And she needed to test her new muscles anyway.

Pulling out her oversized football jersey, she pulled it over her muscled up frame and she smiled at how snug it fit. With no bra in the house that would fit her, she giggled at how her nipples pressed erotically against the fabric. Looking at the gun she smiled. “I could try it out on Randy”, she thought. “See if his muscles can get bigger too.”

Grabbing her MP3 player and the gun, Amanda bounded down the stairs into the weight room. Standing near the entrance she looked over at Randy who met her gaze. His eyes widened at the sight.

“A.. Amanda? Is that you?”

Brad turned toward her and gasped. “Yeah Amanda, what happened to you, you look different?”

Ignoring Brad, Amanda smiled seductively. “Oh, I’ve been working out.”

Brad snorted. “Since when?”

Amanda shot Brad a nasty glance, but quickly softened it as she turned her attention back to Randy. “Well I did get a little help.” She raised up the gun. “This gun seems to be able to add muscles.”

Randy and Brad both looked at her and gun warily. Amanda pushed her right leg out and placed her bare toes on the ground, causing Olympic sprinter sized muscles to burst forth.

Two jaws dropped open as Amanda twisted her leg, showcasing 16 inch defined calves and rippling, thick, curvy thighs. “See!”

Randy was now nearly panting, and a hard-on was pressing forward. He tried to hide his excitement. “That’s uh, pretty amazing. Uh, just how strong are you?” Randy’s mind raced. He had always thought Amanda was pretty and all, but she was also quite plane. He tended to get turned on by the athletic girls. But he never realized how much big muscles would make him react. And the thought of Amanda being really strong only drove his boner further forward.

Amanda giggled as she saw Randy trying to hide his growing erection. She strolled over the bench press bar, which had 200 pounds on it. “Let’s find out.”

Sitting down at the bench Amanda leaned back, while Brad walked behind her to spot. “Are you sure about this Amanda? This is an awful lot of weight.”

Amanda smiled up at him. “I guess we’re about to find out.” Letting out a deep breath that sent her chest heaving forward, she pushed up against the bar and smiled as she was able to pull it off the rack and hold it high. The weight felt heavy, but manageable. Taking another deep breath, she brought the weight down slowly, struggling a bit to maintain control. As it reached her chest, her face flushed red, but she smiled through the strain. With a grunt, Amanda pushed the weight back up until her bulging arms locked. Carefully placing it back on the rack with a little help from Brad, Amanda sat up quickly.

“I guess that makes me pretty strong! And I’m sure I could lift more than that.”

At this point Randy was nearly shaking with desire, while Amanda smiled knowingly. Brad was still scratching his head, oblivious to what was going on between Randy and Amanda. Fortunately for those two, Brad’s cell rang and he quickly picked it up.

“Hi Jenny. No, nothing. Yeah, just lifting some weights with Randy and uh, Amanda. Sure, you can come over. Then I can explain the Amanda thing.”

Brad hung up and looked at Randy. “Uh, Jess will be here any minute. Was it OK to tell her about the gun?”

Amanda sighed, temporarily pulled away from her staring contest with Randy. “Well, I guess so. But let’s not tell anyone else.”

Amanda walked over to the gun and smiled. “OK, who wants to try it next? Maybe we could get you two on varsity in no time!”

The boys looked at each other and shrugged. Randy smiled. “OK, why not try it on me first.”

Amanda nodded her head and turned the setting back to the one she started with. She pointed it at Randy and fired. Randy reacted similar to Amanda’s first shot when he looked a bit nauseous and then flushed red. Amanda and Brad leaned forward, looking for the results. As Randy’s breathing returned to normal he stood up.

“Well, I felt weird, kind of sick and then all warm. But I don’t feel any different now.”

He stood up, his erection still evident, but his muscles hadn’t changed. Amanda looked at the gun quizzically and turned up the dial. “Well, uh, maybe you were already as muscular as the setting. I turned it up even higher than what I had. Let’s try it again.”

But the second shot gave similar results. Amanda cranked it all the way. Still nothing. She pointed it at Brad. Nothing there either. Amanda pouted.

“Well I’m sure it worked on me. I sure didn’t have this body this morning.”

Randy scrunched his face. “Well maybe it only works on girls.”

As they looked all looked at the gun, the doorbell rang. Brad sighed. “Well anyway, that’s Jess. If you two don’t mind, I’m going to uh, head up to my room for a while. I’ll be back soon.”

Randy and Amanda both mumbled their acknowledgement, keeping their eyes on each other. Brad shrugged his shoulders and walked out. Amanda bit her lower lip and stepped toward Randy.

“So Randy. What would you like to do now?”

Randy smiled back, his erection back at full attention. “Well I can think of a couple of things.”