Amanda looked at her now powerfully built mother and gulped hard.
"Bigger, as in more muscular than you already are? Gosh mom, you look stronger than anyone I've ever seen..."

"No dear," Stacy answered as she flexed her pumped arms, staring in amazement as they bulged with strength, "...at least not yet. I was thinking more along the lines of some height. Adjust the knob on the left side up about to about 15 percent."

Amanda looked down at the gun and was about to turn the control when she suddenly looked back up at her mother, sharply.

"Say, how did you know about that knob?"

Stacy looked directly at her daughter, pausing a moment before replying.

"Well, to make long story short, the instructions I received with the unit explained in detail the settings and properties of the knobs, as well as all the properties of the gun."
Amanda stared at her mom, confusion on her face.

"Ummm..., instructions?" She frowned slightly at her mother. "Care to give me a bit longer story? I mean, I just found this down the street and..."

"Of course, honey. All in good time, but for now?" she gestured at the ray gun.

Amanda shrugged but did as her mother asked and, after making the adjustment, pointed it at Stacy and pulled the trigger.

This time a green bolt of energy shot out into the older woman's well- endowed chest, with almost immediate results.

Smiling widely, Stacy closed her eyes as a wave of pleasure shot through her. As Amanda watched in wide-eyed wonder, her mother started growing taller, her already skin tight clothes surrendering in protest with loud ripping as her body expanded.

Her too tight t-shirt now hung in shreds from her muscled torso and her shorts were split into rags around her massive thighs as she grew to 5'10''. Her tennis shoes had burst apart against her feet as she curled her toes in delight.

Opening her eyes, she glanced down at her near nudity with an embarrassed look on her face. Looking up at her daughter she found her staring back with a shocked look on her face.

"What is it!? What's wrong..." Stacy began as she she ran into the small bathroom off of the kitchen.

Looking in the mirror over the sink she gasped as she stared in amazement at the woman looking back at her. She scarcely recognized the stunning beauty as herself. Gone was the short, plain featured woman of forty, with the slightly graying thin hair and tired eyes. Instead, there was a vibrant looking superwoman that appeared to be in her twenties with thick, lustrous dark hair and bright eyes set into a flawless face. Her body was one of a muscular goddess, radiating incredible strength and health. Huge, firm breasts thrusting out from a thickly muscled chest with wide lats and powerful traps. Her arms were were heavy corded limbs supporting shoulders like cannon balls above densely swollen triceps balanced by softball sized biceps that looked ready to explode as she raised her hands to her face.

Looking down she about fainted with giddiness as she ran her hands over her rippling abs and down to her enormous thighs. Cords of muscle disappeared out of sight at her knees, which she couldn't see any longer because of the size of her quads. Turning to look down over her shoulder, she was greeted with glutes like bowling balls atop hamstrings as large as footballs. Flexing a leg back, she was rewarded with calves the size of cantaloupes.
Amanda timidly peeked in the doorway as her mother glanced up.
"H...how do you feel" she asked.

Stacy turned and grinned at her daughter. "Honey, I feel like Supergirl!" As she strode back out into the kitchen, Amanda backed away quickly, a look of fear in her eyes.
Noticing the look, her mother spoke quickly, "Oh dear, please don't be afraid! I certainly never expected this." She gestured down at her fantastic physique.

Pausing a moment, she went on, "Say, you didn't happen to leave the muscle growth setting up, did you?"

Amanda glanced down at the gun. "Ohhh... no wonder..."

Her mother smiled and strode over to her. "Well, no matter anyway. Ready for your turn?"

Her daughter looked up at her, surprised. "Me? Look like that?"

Looking at the super woman she had just helped turn her mother into, Amanda replied: