Disclaimer: I don't own Naruto!
Once Inko convinced her father, Itachi was marriage-sealed so his children wouldn't have any Kekkei Genkai save the Mind Transfer Jutsu. The marriage was the talk of the village because not only had Itachi, genius of the Uchiha Clan, returned from his time as a rogue, he'd actually submitted to becoming marriage-sealed into one of Konoha's lesser clans. The entirety of the Uchiha Clan was furious with this, but Itachi swore that if any of them ever struck out against his wife's clan, he would have his revenge and it wouldn't be pretty.
Fugaku came over to the Yamanaka Complex several times to argue with Inoichi about this arrangement, wanting his son back and demanding the removal of the marriage seal.
"My son won't be marriage-sealed, even if he married into your clan, Inoichi-sama!" he shouted, eyes ablaze with fury.
"Itachi-sama has already consented to it and it has been done, Fugaku-sama," Inoichi replied with a sigh of exasperation. "It is because of this that I've accepted him into my clan as the husband of my heir. He's refused for the seal to be removed because he doesn't wish to pass on his powers as an Uchiha down to his future children, and Inko has accepted that fact without batting an eyelash."
"Are you afraid that if he were to have his seal removed that each child would have powerful Sharingan?!"
"No, I do not, but it was one of the only demands he had in return for making my daughter happy by marrying her and proving to be a staunchly devoted husband to her. He doesn't wish to bring the clash of genes into the clan, nor the arrogance that the Uchiha Clan has displayed."
"Arrogance?! He should have pride of the power he's been given! If you do not remove the seal, I demand that you expel him from your clan at once!"
"Fugaku-sama, with all due respect, you're treating him like a child that's run away. He's a fully grown man who's surprisingly mature and level-headed for one of the Uchiha blood. My daughter wouldn't have married him if he hadn't proved to be her match in every way. I was surprised that it was he who had caught her attention, but he was who she chose. I strongly suggest you accept his wishes and leave him be."
"No heir has ever left the Uchiha Clan completely before him! Being the genius of the clan makes the situation worse! Tension has risen amidst our clan to dangerous levels because he hasn't returned to his birth clan once he was reinstated as a citizen of Konohagakure no Sato! Everyone in the clan wants him back and marrying a girl who will only further the power of our pure genes!" Fugaku raged, before he calmed to a quiet fury. "If he refuses to have children without the marriage seal active, then I will claim the Right of Blood."
Inoichi's eyes widened. "You wouldn't, Fugaku-sama!"
Fugaku nodded. "I will and I am. Bring my son here."
The blonde clan head pressed his lips in an angry line before he nodded. He snapped his fingers and the door to the room opened. "Yes, Inoichi-sama?"
"Tell Itachi-sama that he needs to come at once, no excuses."
"Yes, Inoichi-sama."
Once the door closed, Inoichi glared at Fugaku. "I hope that triumphant smirk is wiped off your face when he breaks yet another tradition of the Uchiha Clan. He doesn't seem the type to follow the rules."
"He has no choice but to follow this or else the worst will happen."
Itachi came in only a moment later and bowed to Inoichi. "Otou-sama, I beg your pardon for my tardiness. Inomaru was being temperamental and he didn't want me to leave him with Inko."
Inoichi smiled, although he was smug at how Fugaku's face reddened at how Itachi had ignored him and addressed the Yamanaka man as "Otou-sama". "You were only a moment, you have no need to worry about being tardy."
Itachi knelt and asked, "What is it you want, Otou-sama? You know that I have little time on my hands at the moment."
Inoichi's smile grew fonder as he placed a hand on his son-in-law's shoulder. "You have brought such happiness to my daughter and myself this past year, and I love you all the more for it, my son. You know that Fugaku-sama has called to meet with me several times since you married Inko?"
"I've recalled that it was mentioned he was here, although I haven't the foggiest why."
Fugaku's face turned puce as he speared his son with a death glare. Inoichi pretended that the older man didn't exist as he continued the conversation. "Well, we've come to an impasse and if one of you doesn't give in to the other's demands, hostilities will rise to the point of violence."
Itachi finally faced his birth father with a cold fury in his eyes. "What is it that you've said that has made Otou-sama call me here to speak to you personally, Fugaku-sama?"
Fugaku was almost turning purple from the anger as he stated, "I've called upon the Right of Blood."
"I refuse."
"You cannot."
"If those words don't appease you, then I'll say it another way: I disincline to acquiesce your request."
"If that's the case, then I will declare war on the Yamanaka Clan."
"The Right of Blood clearly states it can only be called upon only if the conditions are met."
"And they are."
"I must disagree."
"You know it as well as I do, I groomed you to be my heir."
"That is why I have. It states: 'The Right of Blood can only be called upon if the clan member has been married for a year or less, is less than thirty years of age, has been marriage-sealed, and if there hasn't been a child born within that time.' And I can—"
"All those conditions are met, Itachi. You can't wriggle yourself out of this one. You've only been married for eight months."
Both Itachi and Inoichi's mouths stretched into triumphant grins. The former Uchiha man chuckled as he replied, "You obviously don't know anything, Fugaku-sama. Once Inko and I got engaged and it lasted for a whole year, we decided that it was okay that we act like a married couple, just for practice, of course."
Inoichi continued, "I was surprised to find that six months into their marriage, Inko had a son, who she named Inomaru."
Fugaku paled. "You…you allowed them to play around like that?! The engagement would've been canceled had it been the other way around! I'm outraged that you didn't for such adolescent behavior from your daughter!"
Inoichi smirked. "You'd be surprised what lax rules we have in our clan, Fugaku-sama. Inko was born three months into my marriage. I've heard of marriages being skipped ahead as much as three months because of some couples who can't seem to keep their hands off each other during their engagement. We encourage fidelity, but when they mess around with each other, it isn't an issue within most clans, it just spawns earlier heirs. Your clan is very old-fashioned if you think that in the one-year period that a couple is engaged that the two shouldn't have sex. Everyone does, it's just when it comes to your clan they make sure that there aren't any surprises."
Itachi's grin widened and he added, "It's worth it, considering that Inko and I wanted to make sure that no old traditions of the Uchiha Clan would be sprung on us just because we were too prudish to get pregnant until after our marriage."
Fugaku's eyes narrowed as he demanded, "Then how isn't your son more Uchiha than Yamanaka?"
"Easy, I asked to be marriage-sealed on the day of the engagement."
At that time, Inko entered the room, a two-month-old baby boy on her hip, his blonde locks and blue eyes quite apparent. He was squirming like mad and began to scream the instant he saw his father. Itachi smiled and took the wailing infant, Inomaru instantly calm when he rested in his male parent's hold.
"I think he's just being a stinker again, since he doesn't like anyone but you, even me," Inko complained half-heartedly.
"It may have something to do with how you hold him. You didn't get as much practice as I did. Inomaru, you're going to be my son through and through."
At that time Inomaru decided to stick his spit-covered hand into his father's hair, gripping one side of his bangs firmly. Itachi let him, the soft smile still on his face. Inoichi gave Fugaku a meaningful look and asked, "You wanted to ruin this?"
Fugaku stood and stormed out of the room.
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