"Anyway, forgot something." Ben simply declared and turn around.
"What did you forget?" You said, actually curious since he said he didn't need any clothes.
"Phone. Bathroom." He said as he stomped towards the stairs. You knew you had to stop this before he got hit by the flashlight again.
"W-Wait, I'll get it for you!"
You began to run towards the stairs, running past your "little" brother and running up the first few stairs before you suddenly smashed head-first into what felt like a concrete wall. After falling down three steps and landing on your ass, you saw that it was actually the massive arm of your younger brother that was blocking the way.
"No way, loser. Get your filthy fingers away from my stuff."
As much as you wanted to protest or run past him again, you knew that this wouldn't result in anything but a feat of strength for Ben as he'd twist your body into a pretzel for defying him. You could just watch as he made his way up the stairs one heavy, colossal step after the other.
"Dear, why don't you sit down already? Ben will join us soon enough." Your mother suggested with a slightly stern look. Once again, no way he could argue against that, so you sat down and waited as your mother got the food on the table.
Upstairs, Ben once again walked past the flashlight, unnoticed and grabbed his phone which was in front of the mirror. Stopping before it, he couldn't help but flex. He always loved doing it, and his mom and his ant of a brother could certainly wait.
As he was flexing his arms though, he never noticed that his biceps were growing with every passing moment, not that he could anyway. With every flex, every pose, his beyond herculean body reached further and further heights as his colossal muscles grew to gigantic ones, then to behemoth-sized mounds of pure, superhuman strength.
He remembered that just a year ago, while already almost three as big as any bodybuilder ever, he was called a superman. That only seemed to escalate over the next year as the term "super" just didn't cut it anymore. Right now he was considered a super-duperman, and he was certain that this title would sooner or later change again as well. Probably sooner, though.
After his flexing-spree ended, he returned to the dinner table with an overinflated body and an even more overinflated ego.
As you heard the ground shake and rumble even more than last time, you looked in the direction of the stairs and soon saw a leg, if you could even call it that. It alone had more muscle than your mom had on her torso, and your mother's torso was already musclebound. Accompanied by that was a cock several feet long, but still as flaccid as a superpowered brother was allowed to have. As his abs came into view, 12 pillars of indomitable power, shivers ran down your spine. His gargantuan pecs didn't help the case either, but by far the most terrifying sight were his arms. Completely gigantic and pumped as can be. You could only imagine how strong they had to be. Imagining him throwing yachts around the block just like you are throwing baseballs didn't sound all that unbelievable in your mind. And lastly, his newly acquired height of 12 feet to allow for even more mass was truly insane. He completely towered over you, making you feel insignificant.