"I understand, lord." She turns to him, straight-backed and clear-eyed, certain. "When you need me, only call, and I will come. If we succeed in our mission, and I am sent back to the when I came from, I will attend you there, and only ask forgiveness for my belated arrival."

There's every chance Eros will want to keep her here for that whole time; she has to hope he will not.