We'll get to that.

John hefted his flaccid cock, now larger than his previous one had been at any point when erect.
He fondly fondled his newly enlarged balls before experimentally attempting to jerk off.

"Oops".

He turned off his erection suppression and slowly massaged his balls while staring past his cock at Aidea, watching as it quickly grew to it's maximum default size. "I might have overdone it a bit", he thought, "...Naaaaah."

"Aidea, how much can I change this room?"

"You can expand it's size horizontally if it doesn't interfere, and your stepmother doesn't care what happens in the basement so long as the utility area supplies the rest of the house as needed. You could just claim you've decided to remodel, she won't care and it might even increase the value of the house, so if you're spending your money on it, she'll like that. You might have to pretend you're carrying supplies in, but you can use the rulebook to do any of this without doing any of the work yourself. Vertical expansion is very limited, as that would infringe on the basement floor or the floor of the first floor. You could in theory dig a tunnel down from your room and build a bunker or something, but you would need to be careful and shield it from any emissions which might betray it's presence. And not expand sideways once down there into utility lines or pipes. As for the inside of your room, so long as it doesn't get too crazy I think your stepmom will be fine with it. If you start installing bondage gear she might ask questions, but apart from that if it doesn't disturb her, she won't care."

"Would internet access give you more information for this kind of thing?", John asked.

"It's not necessary - The Rulebook is essentially omniscient, so within the limits it had to set on me, so am I. You could search for things I can't tell you about on the internet, and as long as you're protected by enough security layers, you might be able to get info I can't access through The Rulebook."
Aidea frowned in a fetchingly seductive manner. (John hadn't been aware that was a thing until now) "Be careful if you try that route though, I'm expect some former author has made rules about the internet and any number of other things."

John ran a hand down the length of his achingly hard erection. "I need a mirror or two, and maybe..."

He took his right hand (his writing hand) off his dick and began to scratch away in The Rulebook with the pencil that had magically sharpened itself while he touched himself.

New Rule: The Rulekeeper's basement room has floor to ceiling mirrors along the north and east walls, except behind the computer desk.

John swiveled his chair to the left and stared at his reflection in awe. The massive changes to his cock a few sentences had wrought made him bigger than most porn stars he'd watched over the years, and the ones who had him beat were using prosthetics.

"If Jane knew I had this, she'd be trying to seduce me instead of avoiding me." Jane might not meet the standards of Aidea, but variety had an attraction of it's own, and he'd wanted to fuck his stepmom since the day his father introduced them, on the second date he took her on.

"With the baggy and ill-fitting clothes I usually wear I can pretend I've always had this, or if necessary that some of those internet penis enlargement pills and whatnot actually worked for a change. Better be careful with that last, she'll want to try it on her stud farm in the hope they get bigger than I am. Actually, maybe I could develop..."

"Aidea, I need a source of funds other than my stepmom, but not enough to trigger the "financially self-supporting" clause in dad's will yet. Would I trigger any of those traps by giving myself really good skills at chemistry and related topics so I could develop an actually working penis enlargement pill? Nothing too drastic, just one that adds an inch or two of length and circumference to anyone under 9 inches long and/or 5 around. Actually, is that even possible, or would it take magic? And I'd need to hide that income somehow, there is no WAY it would stay below the threshold unless I nearly gave the pills away at cost."

"I'm not aware if that is possible or not. While The Rulebook may know everything, it cannot extrapolate all future discoveries from that information. Humans are too unpredictable. Although the amount of money this would generate for someone who could patent it means it's either extremely difficult, extremely expensive, or requires an approach no one has considered yet. Possibly all three."

"Hmm.." John sighed. "It'd be really noticeable if I were the guy who discovered a working pill-based penis enlargement method after how long it's been pursued, wouldn't it..."

"Yes."

John pondered for a bit. "Can you create a flawless alternate identity for me? My stepmother has me blacklisted with anyone she can pay by fucking or implied potential to do so. I could get some job she'd consider menial and beneath someone whose father was a CEO, and she'd probably allow it in hopes I'd actually get to the "financially self-supporting" threshold. But Dad set that bar high. Few construction workers make $100,000/year, and then they're specialists with years or even decades of experience. I could get a job like that, it'd even be a good excuse for faster fitness and muscle gains, but unless I can work out a deal with some employer, I'd actually have to put in the time, and I have things I'd rather be doing, especially with The Rulebook as a resource."

"What I really need is a job that lets me spend most of my time fucking, masturbating, or playing."

"That's not a job." Aidea told him. "that's the life of someone with income they don't work for, like a large stock portfolio or many owned business and properties they have someone manage for them."

"Or I could get paid for doing things I already want to. There are those camsite/gamer stream combo sites out there. I bet a few people would want to watch someone with my equipment masturbate or even game naked. They'd probably claim it was fake, but watch anyway. And so long as I hid my face and identity well enough, I could make a bit of money to pay for things, which will prevent having to explain too much suddenly appearing. Actually, now that I think on it, I'm going to need a few changes to this room anyway, if the output I specified for this beast is as intended."

Old Rule: The basement The Rulekeeper's room is in was built with high capacity drainage, as the original house owners had intended it to stand up to any future weather without pause, and wanted to ensure the basement never flooded. The drains lead directly into the main flood drain system for the neighborhood. Two of these drains are in his room, hidden under oddly shaped patches of carpet.

Scraps of carpets he'd had to scavenge from a renovation to the TV room his mother had done a few years ago, John recalled. They weren't installed so much as laying on the floor like oddly shaped rugs.

"But that won't do, I can't put on a decent show if I'm masturbating and suddenly pull up a scrap of carpet to jizz into a drain."