As Simon is being force-injected with his own brothers jizz, he unknowingly has his hand mess around with the settings on the program. He was doing this as he tried getting his brother to stop. What he was unknowingly doing was increasing the setting he previously put in, the penis growth. Within moments, his brothers already impossibly large cock was growing even more.
It only took a few moments before the shear size of it, forces Simon through the wall and out of the house, his cock coming out soon. Simon got up and ran up to the room once again, he looked to his computer and noticed the settings, the growth as set to 'infinite'. Simon mutters. "oh dear.." As his brothers cock continues to grow.
He quickly begins messing with it, but his brothers growing rod knocks him away, he had managed to just lower the size, but only to what one could call..planet size.