Fighting the King of Curses for a Vessel

(The later parts fell apart, emmm) Igarashi Kiri is an illusionist with the Mist attribute and a 996 wage slave. Maybe working under a certain chuunibyou was just too exhausting, because lately she's been sleepwalking to another world over and over. And then she found a treasure. A vessel with talent seen once in a thousand years, cute, sunny, and perfect in every way. Igarashi Kiri took good care of her little vessel. She read him bedtime stories, watched movies and TV with him, helped him discover his potential, and even helped him look after his grandfather. And then someone else swooped in and reaped the benefits. A King of Curses who appeared out of nowhere not only took over her little vessel's body, but also bullied him mercilessly. Igarashi Kiri: "?" Hello? This place is already full. "These are fake Six Eyes." Igarashi Kiri pointed at the strongest man, with his pretty, clean blue eyes. "These are the real Six Eyes." Igarashi Kiri pointed at her own red eyes, each marked with the number "six." The strongest: "Yes, yes, you're right about everything. So could you call me big brother?" Igarashi Kiri: "?" The Strongest Sorcerer Wants Me to Call Him Big Brother Those Years I Spent Competing with the King of Curses for a Vessel Jjxx, please stop making Tiger suffer! Warnings: 1. Pairing with Tiger. 2. Lots of original worldbuilding, especially regarding the Samsara Eye. 3. The big guy doesn't get much story time, and most of it involves him getting bullied. 4. A mostly slice-of-life, pure wish-fulfillment story. The heroine's luck is maxed out. Theme: May every wandering soul find its way home.