Amanda started to reach for a bottle when she looked at Justin.
"Umm actually you should have the first choice Justin. I mean after all you put all the hard work into it and it wouldn't be right."
Amanda said stepping away from the bottles.
"Oh I wasn't expecting that, but that's why you're my girlfriend you care for other people." Justin replied making Amanda blush.
Justin opened the blue mild formula and explained "At least being mild, we would have a baseline to start with." gulping it down.
Justin started feeling warm and could tell that his experiment had been a success.
Justin shuddered as he felt a wave of pain overtake him. He watched in awe as his thin legs swelled to fill out his jeans, with full calves and thighs and a round, muscular bubble butt.
He saw his biceps swell larger than baseballs, starting to stretch his shirt sleeves. His pecs turned into melons shoving his shirt away from his new surfers 6-pack abs.
Finally, Justin's clothes shredded, leaving him clothed only the tatters of his clothes. He admired his new body.
His muscles accentuated his new found handsomeness, which had been unnoticeable before.
Justin was very pleased with the results.
"Oh, my" Amanda gasped as she looked at him.