Investing into a wheelbarrow might be a good idea.

Aaron didn't even try to wrap his mind around what was happening anymore. He felt his nuts fill out the space between his crossed legs, scrotum slowly creeping up his thighs. He felt his cock thickening, Lily's soft orbs barely reaching three quarters of the way around it. He felt his rod lengthen, slowly pushing Lily backwards. All this was accompanied by an unbearable tightness, Lily's adept lips and tongue on his swelling glans doing little to alleviate it. With his hands stabilizing himself, Aaron began humping his hips forward involuntarily, a part of him hoping to alleviate the insane pressure if he just got a little more stimulation.

"Woah!" yelled Lily as his insistent humping unbalanced her and she fell on her back with a sticky splash, Aaron's continuously swelling monster coming to lie on her belly.

"Oh shit, are you--hngh! Are you alright?!" Aaron worried, stopping his humping and struggling to his knees, balls now resting on the floor, the cum from his first load sticking to the taut skin.

"I'm fine," the blonde answered, wrapping her legs around Aaron's cum-slicked cock. "Now keep fucking me!"

The tight ring Lily's thighs formed around his ever-expanding dick felt too good for Aaron to answer. Too good to think. He began moving his hips back and forth again, the increasing weight of his genitals limiting him to a slow, almost torturous pace. Aaron's balls were now wider than his legs, slowly nearing the base of his shaft from below and already touching Lily's bubble butt. Grabbing his expanding cock with both hands, he was unable to reach around it, the skin stretching under Aaron's hands. He could feel his frantic heart-beat racing through his throbbing member, the glans slowly advancing over Lily's body.

"Holy shit, this is insane," she squealed. "It's so huge and heavy!"

She grabbed Aaron's cock just below the head, tugging and pulling upwards as if she wanted to speed up its growth, the impatient movements making her tits jiggle enticingly as she stared at Aaron's glans hungrily. Clenching his teeth, he sped up his thrusts, unwilling to disappoint his partner. With every forward thrust, his gargantuan cock reached further up on Lily's body, the girth slowly forcing her legs further and further apart. The tightness in Aaron's genitals was slowly, gradually replaced by pleasure, his balls churning and pressing into their legs.

"Fuck, Lily, it's--oh god! This feels incredible," Aaron grunted, feeling his cock now resting on his swollen balls, lightly squeezing them between his thighs and Lily's tight ass with every thrust. His cock was still swelling, lengthening, the head finally hitting Lily's tits with every stroke. Every time it did, the blonde gasped happily, enraptured by the enormous tool weighing down on her. Aaron could actually feel it pressing harder onto Lily's body with every passing second. His breathing was growing ragged, teeth bared as he snarled with every thrust. The pressure in his genitals was now almost completely gone, replaced by pleasure even greater than what he had felt when he had been inside of Lily.

His dick was now almost as thick as Lily's whole body. As it began sliding through the valley of her soft breasts, she wrapped her arms around it as well, angling her hips upwards so her swollen labia slid over the throbbing length with every thrust. Lily threw her head back, letting it lie in the puddle of cum spreading on the floor, her gasps quickly turning to lustful moans. Aaron could feel pre-cum bubbling up through his shaft, his beachball-sized nuts churning in preparation for a truly frightening load. Thankfully, their growth seemed to have stopped, but a small part of Aaron's mind worried he'd be unable to walk due to their size. Finally, his now drooling cock-head reached the top of Lily's chest with every thrust, pre spurting out in huge globs, spattering over her neck and chin.

"Yes! Yes! It's so hot!" She squealed as the sticky fluid covered her, tightening the grip of her legs and arms. "You're coming soon, right?! Cum for me! I want that load!"

Aaron could feel his nuts tightening as his sensitive glans was rubbing over Lily's pre-slicked tits, their mass much too heavy to be pulled up towards his body. His hips spasmed and bucked frantically as he physically felt his load rise and stretch out his urethra, balls churning to **** gallons and gallons of jizz upwards and outwards. His breath came in grunts as his whole being was consumed by the feeling from his crotch. Aaron was just a cock, hugged tightly against the soft, squealing body of a voluptuous blonde, his actual body a distant sensation. He barely heard Lily's moans and squeals and pleas for him to cover her in hot spunk as he felt his slit widen.

Then, with one last, mighty heave, Aaron thrust his hips forwards and his load shot forwards with the **** of a water hose. With a noisy splurch, it shot out of his cock, clear over Lily's exultantly grinning face and splattered over the hardwood floor of the living room, splashing against the wall and doorway to the entrance hallway, part of it even hitting the hallway itself. Aaron kept jerkily bucking his hips as another shot was released, barely diminished in size, adding to the slimy mass coating the floor. And another.

The fourth and last shot was the smallest, still dwarfing the amount of cum he had been able to squeeze out before the candy. It was **** out of his urethra with much less ****, squirting out onto Lily's face, completely covering it in white, only for her to quickly and noisily slurp down all she could reach, using her hands to swipe more and more into her greedy mouth. Aaron collapsed forwards onto his slowly softening dick, legs spread around his oversized nuts, forcing the breath out of Lily with the added weight. The intense orgasm had sapped all his strength, his mind only slowly recovering.

Suddenly, a scream broke their post-coital silence, part horrified, part surprised.