"Well, either way, I think both of us are just itching to grow older again, right?" Luis suggested. "Somewhere around 21, you said?"
"Oh, totally dude. Let's do it right now. Grow..." Billy started to say the incantation but was interrupted when Luis grabbed his wrist.
"Wait! We can't do this now. We'll burst out of our clothes." Although Luis had to admit that the idea sounded fun, they couldn't do it now. He was pretty sure his mom would notice him missing a few of his clothes.
"Oh, right. Well, let me grab some clothes from my Dad's closet, and then we can do it."
One trip to Billy's parent's room later, and the boys had a pair of clothes that would hopefully fit them once they were adults. Although the boys then realized that they need to take off their clothes, so they don't destroy them while growing up. So, feeling a bit embarrassed, and in Luis' case turned on, the boys took off their clothes prepared to grow up.
"Alright, let try this again. Age us seven years!" Billy commanded, and once he finished speaking, the two boys let out a groan as they felt the sensation of aging once more.
Billy didn't know where to look while the process was happening. One moment he was looking at Luis seeing his pecs push out, forming into slabs; the next, Billy was looking down at his own body to see his pecs follow suit. Then he looked at the mirror to see if he could get a better look at his body. Billy was so ecstatic as the thing he wished for the most was happening right before his eyes. He was getting bigger, stronger, taller, and even sexier, and it felt oh so good.
Luis, meanwhile, was mainly focusing on Billy's changes as his lust for him grew. He watched as Billy's arms got bigger, his shoulders got wider, his abs getting more ripped. He even managed to get a look at Billy's ass when he turned towards the mirror, and what an ass it was. The sight of that caused Luis' junk to become semi-hard. Hopefully, Billy didn't notice that, but it seems like his junk was half hard too. That made sense considering how good the transformation felt.
Then Luis realized that just staring at Billy wasn't the best idea. So, he took some time to look at his own growing body, and he wasn't regretting that decision as he watched his body become more muscular. Before, he could have only imagined having a body like Billy's, and now he was exceeding that, and it was all thanks to tricking the cube. Although he wasn't sure if they successfully tricked or was this what would happen naturally? Well, either way, more testing would be required but not on him. After feeling how good it felt to be big and buff, Luis will make sure he'll grow up the same way naturally.
Eventually, the changes stopped leaving the two young teens as two young adults hunks.
"Woah, look at me. Look at us! We're adults now! I'm bigger than my brother, heck I'm bigger than my Dad. This is so awesome!" Billy exclaimed as he started to flex his new gym rat body. He couldn't wait until Katie saw him like this.
"Yeah, we look incredible. It feels incredible too. I never thought I could grow up to be this buff!" Luis replied as he joined in on the flexing. While he was doing that, he noticed that he was now taller than Billy. Only by an inch or two, but it was still mindblowing that he was taller than Billy now.
"Alright! Want to get dressed and get out of here?" Billy asked, excited to go out into the world as adults with Luis.
"Yeah, but first, is it okay if I feel your muscles?" Luis asked, trying hard not to smirk and give away that he was going to do something a bit mischievous.
"Oh, sure thing, bro." Billy flexed his arm so that his friend could feel them. Although he was a bit confused when Luis came from behind him to feel his bicep.
"Ooh, very nice. I can tell you've been working out hard in those seven years." Luis complimented as he squeezed Billy's bicep.
"Aww, thanks. Your arms look grea... huh?" Billy wanted to return the compliment, but he was stopped when he felt Luis' hands moved to grope his chest.
"These pecs are nice too. I think they're bigger than our gym teacher's pecs." Luis teased, while one of his hands began to move down to feel Billy's abs. "Oh, and your abs are rock hard too. It feels like a brick wall. A very sexy wall."
Billy shuttered as he felt the Luis' hot breath on his neck and his hands roaming his body. He was so innocently confused about why he was responding like this. He was even more confused, though, about why this felt so good, and why he didn't want to stop? However, just as soon as he thought that Luis had stopped and taken a step back away from Billy.
"So, that was fun," Luis started while letting that smirk finally show up on his face. "What do you want to do next, Billy?"