Out of the corner of his eye, Steven saw Natalie struggling to pick up a heavy box, within a few seconds he was at her side offering his assistance, which she was willing to accept.
"Thank you" Natalie said gratefully, sweeping her hair out of her face and behind her ears. As Steven then effortlessly lifted up the heavy box, Natalie went through the songs on her mp3 player that she always listened to while on the shop floor. After finding a song that she liked, she made sure the ear plug was firmly in her right ear, and then she followed Steven.
"Thank you very much" she said again, after Steven had set the box down in front of the shelf that needed refilling with bottles of sterilising fluid.
"My pleasure" Steven replied, as he caught Natalie glancing at his biceps.
Steven then arched both his eye brows and started walking away, but then he turned back to look at Natalie, who now had her back to him, still fiddling with the ear piece of her mp3 player.
He tilted his head and viewed Natalie from different angles before experimenting a little. "Maybe a little taller" he muttered to himself quietly. And with that, Natalie started growing in height, first one inch, then two...then three, and as she did so the bottoms of her boot-cut trousers retreated up her legs. When she had reached 6 feet in height, the same height as himself, Steven stopped the growth spurt. Her trouser bottoms, which had been trailing on the floor under her sneakers just moments before, now only extended down to her ankles.
Natalie then crouched down and resumed working, despite the fact that she was now six inches taller than she had been. Steven smiled to himself. "Perhaps a little girth to go along with that new height" he chuckled, deciding to give Natalie some enhancements like his own.
He watched as Natalie's shoulders began broadening as his had done earlier, her muscles also started to firm up and expand, stretching her sweatshirt and other clothes as they did so. Not wanting to go too far, Steven stopped after a minute or so. Just long enough for Natalie to acquire impressive biceps of her own, along with a rock-hard 'six-pack', a strong back and leg muscles to match. When Natalie turned around, her breasts weren't as prominent under her stretched top due to her increased muscle mass, but Steven knew they had to be there still.
As Natalie walked away, oblivious to the changes to her body, Steven followed, watching her with interest, and also incredibly turned on. His cock by this time was once again fully erect, and he rubbed it hard as he walked behind Natalie, being careful that nobody saw him.
After a while though, Steven glanced at his watch, he had to get some work done, or at least...that was kept telling himself. He looked at Natalie again and decided he couldn't leave her like that, she did look kind of freakish. It took only a few seconds to return Natalie to her normal dimensions, and he then left her alone, at least for now, heading back towards the Cleaners aisle.
But someone then caught his eye again and another little detour followed.