If Mira became startled and attempted to leave quickly, it would confirm the Sovereigness hadn't sent her. But if she stayed for some reason, it would validate his suspicions.
Mira's expression briefly showed realization before she replied firmly, "You don't need to worry. I've made sure to delay their arrival, so we have fifteen more minutes alone."
"No, that won't do. How we became so powerful isn't something that can be explained quickly. Besides, we still have many questions about what you've just said," Orion replied, shaking his head in refusal.
"How about this: I'll meet with the Sovereigness and request a personal meeting with you to continue this conversation." His interest had shifted from her true motives to unravelling the mysteries of the Voidheart.