Mr. Mendes was in awe of how insanely massive Marco had become. But, his lust for growth had not subsided though this time it was not for him. He grabbed the spellbook, now tiny in his huge thick hands, and managed to see over his massive pumped pecs to a spell that would increase Marco's muscle mass even more.
"Musculus incrementus!" Francisco bellowed, his deep rumbling voice shaking everything around him.
Marco felt his body tense and then loosen repeatedly. Each time pumping up a bit more. He moaned deep, low, boner inducing. His enormous round juicy pecs swelled bigger and bigger. Blowing up like balloons full of rock hard vein covered muscle. Upon seeing this Mr. Mendes could stand no more, he lumbered over to Marco, each step leaving holes in the earth due to his massive muscle bound body. And, being just the right height, began licking Marcos monstrous hairy pecs. Worshiping them as they pumped up fuller and fuller bigger and harder. At the same time the rest of his body was growing just as big. His lats thickening and widening, pushing his inflating arms up to 90 degree angles. The deltoids threatening to crush his bearded masculine face were only kept at bay by his immense traps that were well over ten feet above his head. His biceps and traps swelling, pumping bigger and bigger and bigger and bigger, lined with throbbing veins thicker than most men's wrists. His abs bulging out like massive concrete bricks, pushing his still growing pecs up higher. And his gigantic muscle ass, it stuck out at least 13 feet and rose up to rest at his lower back. Two enormous hard globes of muscle, pulsing and growing bigger. His back itself was so thick it stuck way out behind him and was marbled with deep crevices that bulged and moved. Marco's quads and hams had begun growing so round and thick that his stance was getting pushed further and further apart, as horny as this was all making him he got worried that he might be able to stand soon, even with calves bigger than cars and feet that could crush a building. He tried to utter, "desino," but his pecs had become so gargantuan they pushed his mouth shut so he could only moan in his deep guttural bass voice. This made Francisco happy, he knew he controlled Marco's growth now and that any second Marco's muscles would be so huge he would be immobile. Just at that moment Marco felt his still bulging pecs throw him off balance and he fell face first. He was still at a 45 degree angle because his chest was so massive and his freakish cock snaked up between the cleavage. His massive bubble butt sticking up in the air. Mr. Mendes let the growth go on just a bit longer, watching all of Marco swell and grow and become beyond anything anyone could imagine. Pure hairy masculine muscle. He had never been so turned on, but had another idea...