Naruto: My Uchiha Girlfriend is Too Tsundere

(Single Female Lead ➕ Gender-bent Sasuke ➕ Power Fantasy ➕ No Conspiracy Theories ➕ Reincarnated Naruto ➕ Lighthearted Slice-of-Life ➕ Regret Rectification) I transmigrated into the world of Naruto and became Uzumaki Naruto! I thought I'd have to retrace the old path of a hot-blooded underdog's comeback, but at the very beginning, I awakened a system – as long as I establish a connection with an original character, I can gain opportunities to become stronger! Flying Thunder God? Learn it! Wood Release? Practice it! Sage Mode? Cultivate it! And secretly get a pair of Mangekyo Sharingan, then create a mysterious alias to play around with... Just as Naruto was rubbing his fists, preparing to both rectify the regrets of the original story and reach the pinnacle of his life, fate gave him a huge "surprise." On an ordinary day, Naruto was teasing the tsundere, long-haired Uchiha loli in front of him, filled with emotion: "So cute... It's a pity that in a few years, she'll be massacred by a certain 'filial son.' I need to find a way to save her." However, the next second— Naruto: "...What?!" Sasuke? That cool, constantly "hmph-ing" and "harrumph-ing" Sasuke? But the one in front of him was clearly a long-haired, tsundere, and awkward Uchiha loli! Oh, now her name is Satsuki.