The question of whether I'm willing to trust Little Bowl is implicitly answered. Since Little Bowl specifically asks it here, it's naturally not without reason.
Having Little Bowl become the Master of the Doomsday Divine Seal, and as the complete Master at that, means that the power dynamics between us will reverse. The once weak Little Bowl will suddenly become an entity far more powerful than I am. Even if she hasn't merged with the Current World Divine Seal and isn't a true Master of the Divine Seal, she can, with a single thought, change the world and become the God of this planet.
It's not about fulfilling me, the one fighting on the front lines, first, but rather fulfilling her, who strategizes behind the scenes. Even though we have an unbreakable bond of trust, the authority of the Master of the Doomsday Divine Seal is so immense that it needs to be reconfirmed here.