Dave pinched the bridge of his nose. Until today, he thought that having a ten-foot cock would be pretty fun, but being immobilized wasn't fun. Besides, he was rapidly stiffening and he wasn't sure if he could take much more stimulation down there without his head exploding. He was overwhelmed, he was irritated, but most of all, he was horny beyond belief.
"You wanna have fun? Sure, let's have fun. Give me back my mobility and give yourself a pair of tits and ass that defy belief." Lara giggled.
"Ooh, fun!" she said as she climbed off of Dave's dick. She pouted her lips as she backed up towards the computer and bent over, exposing her admittedly-impressive cleavage. "Just don't be too mean to me when I'm huge, okay?" She placed a finger in her mouth and gradually pulled it out, sucking as she did. "I only wanna have some fun with you." She sat down in front of the computer and typed something.
In an instant, Dave felt a peculiar feeling in his cock. It wasn't the growth he felt earlier, and it wasn't another oncoming tsunami of jizz. At least, he hoped not. He looked down and, experimentally, focused on the end of his dick. It bent. Dave's eyes widened as he kept his focus on his dick and watched it bend and twist. With some effort, he put one of his cock on the ground and scooched himself forward. He placed his legs underneath him and pushed up with his knees and semi-erect dick, shoving himself into a standing position. Dave stumbled a bit before finally finding a stable position for his legs and manhood.
"Okay, that's one part of the deal done, but what about the next bit?" he said, looking at Lara. She was standing in the middle of the room, and in the time that it took Dave to stand up she had stripped down to her bra and panties. "Oh."
"You're damn right, 'oh,'" she said, a shit-eating grin plastered on her face. "By the end of this you won't be able to say much other than 'oh'-oh." Both lovers looked down at Lara's breasts. They were rippling like a bowl of Jello in an earthquake. Lara's face widened into a beaming smile, "Oh!" she cried. Her hands flew to her chest. "Oh, oh god! Th-this is...oh god why aren't they growing this feels so good! Why aren't they--"
Lara's bra exploded off her as her breasts heaved outwards. Dave's perception slowed as he saw his wife's tits grow to the size of basketballs in a fraction of a second, their expansion heaving her chest into the air and throwing her hands outwards. In the next half second they had swelled to the size of yoga balls. Lara was trying to keep her hands wrapped around her own chest, but now she could barely reach halfway across each tit. Her new endowments slammed into the ground with a heavy thud, shaking the floorboards beneath her. The house was beginning to creak under the pressure of Lara's breasts.
Lara's face, in the meantime, was beginning to creak with the width of her manic grin. The force of the impact had driven her to her knees, and her mouth could barely be seen above the arcing curves of her tits, but Dave knew the look of a madwoman whose dreams were coming true. He focused on his cock, willing it into motion.
"Oh Dave!" moaned Lara, her hands moving backwards to her ass. "This is the best day of my life!"
"Isn't the day I marrie-"
"You're cute when you're stupid," said Lara, "But seriously, run. Run now. I'm trying to keep a hold on this but uuuhnnng!" A rumbling sound was coming from Lara. Dave didn't need to be told twice. In a shockingly-fluid motion, he hurled his cock towards the deck of the house, pole-vaulting himself into the lake outside.
When Dave came up for air, he could see the underside of the cabin's deck, and he could hear Lara howling in ecstasy, but he couldn't sense any other changes. He hadn't been around this computer for that long, but he was getting suspicious.
"Lara?" he called out, "Honey, are you alrigh--"
Bits of wood exploded outwards from the cabin as Lara bellowed a cry of pleasure that barely sounded human. Before he could see what was happening, Dave instinctively hurled his hands in front of his face to protect himself from and flying mass of splinters that was once Mr. Salas' house.
"Oh god, Lara are you--" said David as he looked back towards what the former site of the cabin. In front of him, within his cock's reach, were a pair of soft, colossal tits. Were he to balance himself vertically on his own dick and reach upwards, he'd barely be able to brush Lara's colossal nipples. Dave knew this because within a second of seeing this, he had tried. He lowered himself back to the ground and edged himself around the bulk of his wife's inhuman assets. In the distance, he could see an ass the size of a small house arcing outwards, destroying the back half of Mr. Salas' cabin. "Are you okay?"
"I'm mmmhng better than okay, babe," said Lara, "I think I know how you'd have felt about your new dick if you weren't being so wussy about it."
"I...Lara you do know that you destroyed half of the cabin we were supposed to be looking after, right?"
"That's what makes it so hot!" said Lara. Dave couldn't believe it. She destroyed their boss' weekend retreat, which probably wasn't a big deal if he was already in a sex-goddess dimension, but, more importantly, the computer which could turn them back to normal was probably ground down to sand beneath a tit bigger than their whole apartment. How were they gonna go back to their old lives now? Hell, how were they gonna fit into their car now? In frustration, Dave hurled his cock upwards, latching onto a bit of Lara's body where her breasts and ass smushed against one another. He sank his dick into the soft pocket of flesh and pulled himself upwards, willing himself not to cum as he ascended.
Five minutes after his willpower failed him, he returned to consciousness and dragged himself into his wife's field of view.
"That's what makes it so hot?! Lara, in case you haven't noticed, the only way I can move around is by using my dick to drag my body along! Hell, you can't move at all! If our car wasn't destroyed in the explosion your tits created--" Lara's face turned into the picture of demonic arousal "--I won't be able to fit in there, and you sure as hell won't be! Do you think the security team will listen to the perverted sex-toy kaiju that destroyed their boss' home, or do you think they'll try to shoot us? You might have enough padding to survive--" he slapped Lara's breast, the resulting ripples sending him bobbing up and down on a sea of boob -- "but I don't!" Lara reached out and patted the part of Dave's cock that was in reach.
"Dave, you silly," said Lara. "You don't need to worry!"
"I don't need to worry?" Dave's tone of voice had reached a level of arousal and panic that left him sounding like a horny chipmunk. "You destroyed the only thing the can turn us back to normal!" Lara's brow furrowed.
"Well, first off, Dave," she said, a tone of indignance slipping into her voice, "you were the one who wanted me to type in a wish for bigger tits into a computer that gave you a cock larger than the two of us put together--"
"Okay, fair"
"--And secondly, while it's fair that you didn't notice, there's a surprise waiting for you!" Dave paused, horror seizing his body like his cock was trying to seize his wife's right boob.
"...What's that?"