I Am Uchiha With A Son System

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The marriage between Haruko Hyuga, Uchiha Setsuna, and Uzumaki Akari went well. In this feudal Japan, there is no polygamy, but the people there accepted concubines. Usually shinobi will marry only one wife, only those noble weakling daimyo who choose to have as many concubines as possible.

But because he was the strongest ninja in the world, no one refutes the fact that Setsuna married two wives. If the Uzumaki clan rejects, that means they will lose a stronger ally, and they know Uchiha Setsuna will choose Hyuga to be his wife rather than make her concubine, so they just accepted it.

As a modern person, Setsuna feels reluctant to practice polygamy because he is a believer in true love. But because of this, he really gave fair treatment to both of his wives, he bought a house next to each other so his wives didn't fight with each other. He only practices romance inside his house, sometimes he cooks with his wife, buys a necklace, and so on.

They were a really happy family, and suddenly Setsuna received a notification.

"Congratulation, host, for your wedding. Many men wanted to become like you. You have many wives, but you are an ungrateful brat who didn't appreciate it."

"Shut up, system. I have followed your instructions, so what is my reward?"

"So for your first reward, every time your wife is pregnant, she will have twins, triplets, or more."

"Oh good, wait for the first reward? Is there a second reward?"

"Yeah, your second reward is the perfect elixir. Usually, when two dojutsu users marry each other, they will get both eyes from their parents. Your future son will have one sharingan and one byakugan, but with this elixir, one drink can make any curse, poison, or fuinjutsu left in his body and also make your future son combine both sharingan and byakugan, which means, "

"White sharingan?" cut Setsuna before System finished his speech.

"Yeah, true. Actually, this elixir is enough for three people, but you only marry two wives, so you can give anyone extra elixir."

Of course, Setsuna knows that his wife will get both sharingan and byakugan, but this reward makes his anger towards the system go away. Will Masashi Kishimoto cry if he knows about white sharingan?

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Uchiha Kagami likes Chino since she was paired with Chino Chinoike, unlike the black hair of Uchiha, Chino with grey or white hair is so cute. But after going through puberty, he knows that this feeling is actually love. Luckily, Chino also likes Kagami since they always train together.

One thing leads to another, and when Kagami decides to follow Setsuna because of her Chino, she readily accepts Kagami's confession. So when they reach 18 years old, they also marry each other. During their marriage, Uchiha Setsuna gave Chino some kind of bottle and told Chino to drink it and don't let anyone see it.

After she drank, all the waste, heavy metals, and toxin on her body suddenly gushed out of her skin. She feels lighter, stronger, and full of energy. Uchiha Kagami was very happy when Setsuna gave those elixirs to his wife.

During this wedding, Setsuna sneaks into Konoha and invites both Kagami parents. Their parents are really happy that they didn't see Kagami for a long time. But back to the present, before this happened, now is a Konoha reaction when they know Setsuna left and is living with the Uzumaki clan.