Etsuko's voice held all her unasked questions; questions he needed to address. He cleared his throat noisily, and, with nothing else to do, decided to try Jorick's approach.
Just say it.
"I've been thinking. It's-it's been two years since you came to be-since-I-I believe it's time to release you from your blood debt."
There, that was the softening up gift. Only instead of looking "softened", she looked confused.
"Oren-sama wishes to release me? I do not understand. Do you mean for me to leave?"
"No!" He got control of his panic. "No, no of course not. Don't the Japanese-Do you not have-never mind. It's-When a vampire makes a fledgling, they owe a blood debt to repay the gift of the immortality. During that time they have to do as their master commands, go where they command-I thought you understood that?"
"Oh. Of course." Though her tone was pleasant, her gaze was unsettled. "But Oren-sama releases me from this debt? What does that mean?"