They head downstairs

"Hell yeah!" Natalie practically yells. "Let's go. Hang on tight down there, little guy," she adds with a wink as she pushes herself up. Ricky desperately scrambles across her glans, dashing for the subtly flared edge and just barely making it as she stands up and her enormous shaft goes horizontal. Panting slightly, he clambers onto the top of her cock and pulls himself to his feet just in time to nearly lose his balance again as Natalie starts walking, sending her cock swaying side to side in front of her. "I told you to hang on tight, silly," she giggles.

"You did that on purpose!" Ricky counters, plopping himself down and spreading his arms to either side to steady himself. Natalie just smiles coyly in return, busy navigating herself towards the basement. God, she looks incredible from here, Ricky can't help but think. She'd ditched her top and bra at some point, and everything from the waist up is on display - her toned tummy, those perky B-cup breasts, that pretty face of hers with her hair so perfectly messy around it. Not to mention the absolute monolith of a cock I'm riding on!

Sitting at the end of her monster horsecock, the rest of her seems so far away. Its sheer mass slows its motion, the sensation reminding Ricky of the time he was on a cruise and they passed through a storm - slow, gentle heaving. He can hear her full, heavy nuts slapping against her thighs as she descends the stairs. How did she ever hide those things?

"Alright, we're here," she announces, snapping him out of his lustful trance. "Where is the... oh! That's gotta be it!"

Ricky tears his eyes from her and turns his head over his shoulder, following her gaze. "Yeah, that's it! Still powered on, too. Lucky for us."

She quickly makes her way over to it, examining the machine. "How exactly did you manage to set this thing off the first time?" she asks idly, gawking at the massive emitter with its array of heat-sink fins and cables.

"Errr... I think I knocked something down and that activated it," Ricky replies sheepishly.

"Pfft, doofus. Oh! Here, there's a computer." Her cock presses against the workbench the machine is mounted to as she reaches for the keyboard, and Ricky takes the opportunity to hop off. Certainly wouldn't mind staying, but I don't want to grow with her!

"Hmmm..." She ponders, peering at the screen. "What's it say? I can't see from this angle!" Ricky blurts excitedly.

"Hush! There's a bunch of options. Gonna switch it to... growth mode. Fifty percent sound good? I don't want to hit my head on the ceiling." She giggles to herself at the thought. "Oooh, quantum exploits?" Natalie moves the mouse across the screen, hitting checkboxes and dragging sliders at a whim. "Recursive mode? Exponential expulsions? Expand and enhance? Fuck it, why not. Size is power, energy sponge, randomize intervals..." *click* *click* *click*

"...BBB? ...Goddess-ify?" She has a confused grin on her face. "Ricky, what the fuck does that even mean?"

"I-I don't know!" He replies, a bit flustered seeing those huge, pretty eyes focus on him. "I didn't make it, I only set it off by accident!"

"Pfft. I thought you were a nerd. You're supposed to know this stuff!" She snorts, teasing him. "Well, considering that this program is apparently named 'Reality Engine: Size Kink beta 0.9.v', it's probably something fun. I guess we'll find out what kind of stuff your dad is into huh?" Ricky almost gags at the thought as she clicks the final two boxes.

"Alright, little guy. It says 'Ready, press spacebar to fire'. Want to do the honors for me?"