It... it's b-b-bigger than his forearm

It's always been bigger than his forearms. Basically, his drawing is anatomically correct except for that higher laser beam

After 90 chapters, I know he had a gigantic dick, but to be shown this explicitly, it's just something else. Idk if that's what you meant, but real dicks normally arent that size, I'm pretty sure the man would pass out whenever he gets hard.