Reborn as Toothless, I Contracted with the School Belle Who Is an Empress

I am Nefarian, the World-Ending Demon Dragon, also known as Toothless. To advance my cultivation and suppress my sworn enemy of ten thousand years, Empress Yaoguang, I reincarnated as the F-rank spirit pet Night Fury, Toothless. It is a shameful humiliation, to be sure, but also a masterstroke that conceals my true purpose. Yaoguang, you wretched woman. Once I regain my strength in this soft, warm embrace, I will show you what true terror means. Empress Yaoguang, I will crush you for ten thousand years. Huh? Wait, something is seriously wrong with this Su Muxue. She has reincarnated as Yaoguang. Hahahaha, Yaoguang, you never saw this coming! I, Toothless, am Nefarian the Demon Dragon. I am Empress Yaoguang, also known as Su Muxue. I once held the stars in my grasp, and with a flick of my finger could turn heaven and earth upside down. I reincarnated in this world only to bide my time, rebuild my foundation, and take revenge on that Demon Dragon. The Toothless I carefully chose is the perfect disguise. I will quietly build my strength, then return to the Ninth Heaven one day as an Empress! Nefarian, World-Ending Demon Dragon, one day I will suppress you for all eternity. Huh? Wait, why is this Toothless so wicked? He has reincarnated as the Demon Dragon. Hahahaha! Demon Dragon, you've fallen right into my hands.