Why, siblings of course!

You had always lived a good life, in your opinion. Two caring parents, a nice house, and later on you had a few friends at the Manga club, one of which you had a good feeling might last beyond graduation. It's part of why you're so cautious when using the Rulebook since it was the tool of a Protagonist. Almost all protagonists are either dumbass every-man types who barely use their powers for fun, crappy author avatars that get canceled quickly, or tragic figures who use their powers wisely and for themselves to off balance how crappy their lives had been. You didn't fit any of those. So far, you would like to think, you've been careful and calculating with so that no one could find you, but your past is far from ideal, not crap. In the back of your mind, you're worried that whatever **** gave you this wonderful book would rip it away from you someday, or send a rival to steal it from you.

Thinking along these lines... you realize that there is one thing that you could do that would make you happier. One thing that you've wanted since you were ten.

A sister.

Your parents loved you dearly but... they didn't exactly plan you. While you were an accident, they always made sure that you knew that you were a happy one. They told you that when your Mom got pregnant, they both panicked at first. Worried about things like long term commitment, the age gap between them, and most of all providing you a good home. Funnily enough, an abortion never crossed either of their minds despite its legality in your state. Then, one night, you're parents discussed what color to paint your walls. They didn't want to know what your sex was going to be, so they argued all sorts of neutral shades. At that stage in their relationship, most of the time they had late night talks with a couple of beers, but your Dad abstained from those until your Mom could join in. It was then, the two of them leaning against one another while talking about paint that they realized that they couldn't live without the other, all previous worries gone. Your Dad proposed two days later, spending a good chunk of his savings on a ring. You were born two months after their wedding, a small and intimate affair with their friends.

You, Vincent Ivy, were a rough birth. You were a chunky baby, and it took a good 20 hours to get you all the way out. Your Mom was fine, outside the normal 22 shifted bones and massive muscle stretching that every woman suffers with after labor. However, she swore off doing that again, your Dad reluctantly agreeing since it was her who had to suffer. That cemented your life as an only child, in some ways a blessing in others a letdown. You listened to your friends throughout your life complaining about their siblings. When you were in early schooling, they complained that their little brothers/sisters were 'hurting their mommies' or taking all the attention off of them. You agreed at the time, glad that you were your Moms 'only angel'. Then, you started watching them, those people who always complained about their siblings and... it started to feel like you were lacking something. It's irrational, you recognize, to want a sister. Your life is already great, so why would you need a sister to make it any better? But, **** fetish aside, you still yearn for one.

You look at your Rulebook. The power to change that was well in your power.

Firstly you changed the name at the top of the page to simply 'My Household', a much simpler way that you're not sure why you didn't think of it earlier. Still, it was good to know that you could use the book to target yourself, so it was a worthy experiment.

With that minor change out of the way, you had to figure out the best way of giving yourself a sister. You still had a few hours before clothes started to become unnatural to your family, so you wanted to have that figured out before it kicked in.

After all, as far as prices for their existence goes, nudity is a good down payment, you thought with a sharp smirk.

For starters, you didn't need to make any caveats for her attractiveness, since that is pretty much covered by the 'back medicine' that you gave your parents. You're... decently sure that you don't need to **** her to be nice to you, as your parents are the bomb, after all. You decide that you're largely going to leave her personality to chance since that seemed the most exciting of all, but you were going to put in some qualities.

You spend about an hour and a half just deciding what all you should write down. There are several pages of notes and potential rules on non-Rulebook pages to get your ideas down. They were also there for another reason, but it really isn't that important right now. The main problem's you had were the price of living and a good, logical reason to have a sister. The latter is relatively easy to solve, just make it to where your Mom had twins and boom, instant sister. The problem lies in the cost of living though.

You barely remember the worst of it, since you were so young, but your parents had a hard time early on in your childhood. Your mom wanted to stay at home with you since they didn't want to spend a lot of time looking for a baby sitter when your Mom's job paid a relatively little amount. However, your Dad's jobs over the years didn't pay quite enough for what they wanted to give you, so your Dad sometimes had to make harsh sacrifices for you and your Mom. While the easy solution was to just make your family rich, those same hardships are what made you so close in the first place. Hell, you're not 100% sure you would have gotten as into manga as you did if Dad didn't showcase his mint comics before he sold them off that first time. It was this hardship that formed you as well, though you're pretty sure that mentally you'll remain the same since you own the Rulebook. You didn't have your memories altered, at any rate.

So the problem remains, how to give yourself a twin sister while neither bankrupting nor overly enriching your family? The wording was key here.

After a good long while, you managed to come up with a Rule that kept the balance.

"Old Rule: Though unaware of this fact, members of this household can accommodate any number of dependents at the same income level as if they only had one. The increase can either be in increased clients, smart investments in their own company or others, or a paycheck increase that reflects this. If the job/business would allow for an upper middle-class lifestyle with only one dependent, then even with 15 dependants it will pay enough money to accommodate that amount of in a middle-class lifestyle, including presents and special events. As the number of dependents in the household decreases, unnoticed but accounted for, so does the income from any job/business. Nothing and no one anywhere can notice the increase of payment, outside the members of this household who will believe it is just a normal pay increase that anyone would get. They will never discuss this phenomenon with anyone who is not a member of this household and the money is magically produced just for the members of this household, perfectly laundered as to not incur suspicion."

That seemed good enough. It was basically a money multiplier based on the number of dependents in the house. You used dependents, since your 18. Wouldn't do for your parents to suddenly run out of money for you and your sister because you aged out of being children. You sometimes wonder if you're being a bit over-detailed in your rules, but this book seemed very literal.

Now, before you poof your sister into place, you wrote down her ground rules. You were still a bit iffy about it since it crossed into the brainwashing territory. Still, you decided that since they literally would not exist without your intervention, it was OK morally to set a loose framework for how they will be.

"Old Rule: Any siblings of Vincent Ivy will have the following traits, no matter what their personality is and their history will be altered in such a way as to include how they became this way:

• They will love their brother, Vincent Ivy.
• They will not make fun of his hobbies beyond a playful ribbing no matter how out of the norm they are.
• They will not attempt to take the Rulebook without Vincent's direct permission.
• They will not attempt to coerce or trick Vincent from giving them the Rulebook.
• They will be more likely to tell Vincent their secrets than normal siblings, though they can still keep these to themselves if they wish.
• They will make time to hang out with Vincent twice a week, once by themselves and, if there is more than once, once together with all other siblings..."

You thought about stopping there, but... your fantasy sister had a few more traits. You suppose that one or two more couldn't hurt...

• "...Vincent and his siblings will share one room. Any home that they live in will, although unnoticed by anyone other than Vincent, magically adjusts so any rooms that would have been slated for each sibling and Vincent will become one room with a combined size. This will not change the exterior of the house. This will still leave room for hallways, guest rooms, etc etc. Any adjoined/en suite bathrooms will also undergo this same effect.
• If any of his siblings should be stressed out, in such cases as upcoming and important tests or higher, his siblings will ask for a massage. Vincent will become a near expert at massaging them, reducing their stress. "

Hmm... You'll think about adding more later. You flip to the next page in the rulebook. You had given those traits a lot of thought and were really on the fence about making it to where your sister would look like one of your favorite female characters, or even having it to were your sister were all looked and acted like one of your waifus(easier than saying favorite female character). You could add it easily enough to the traits with just a little adjustments, and it would still be random enough to be exciting and-

No, you weren't sure on that. You'll think about it for a few more minutes, the halfway mark to the nudism 'curse' you placed would activate.

Now that you adjusted it to where your family could afford her and made sure that her base traits would make her a good sister, all you had to do was add in one little rule... one that would change your life for the better.

"Old Rule: Vincent Ivy was the only male born in a set of ( ). Despite the multiple births, their mother had a tiring but healthy pregnancy and labor, with no complications. She and all her children including Vincent lived."

There. Now all you had to do was write 'twins' in that blank spot and you would have a Sister.

But... you wonder. You made your rules in such a way so that all your siblings would have those same traits, just in case your parents decided to adopt or have more kids later on but... what if you wanted more sisters? You could just as easily write 'triplets' or 'quadruplets' or more. By the way you wrote your Rules, you could have as many sisters as you want without any repercussions. They would all be their own girls but also have those same base traits that would make sure that they would be sweet sisters. You could add more traits even, perhaps enacting your waifu siblings plan.

You guess, since they would exist purely by your whims anyway, you really should decide this based on what kind of lewds you wanted with your sisters.

AN: This is a great branching off point story wise. If you feel like it, please show us what your master sister lewd plans are. After this chapter, things will start getting steamier, for those of you patiently watching for the sex scenes.