[The naked change in expression is new - Ayumu has never before been so painfully open with what she feels he's pretty sure. But without memories, wouldn't everyone be different in some ways?

Memories... It's not hard to imagine what she'd reacted to. It's happened to him a couple of times, little niggling hints followed only to find a sudden abyss opening up in front of his feet, a huge and terrifying NO resounding through his thoughts.

It makes him wonder if Ayumu as a god liked him calling her that because someone else had done the same before. But he can't ask now. Instead he sighs, lowering his head in apology.]

I'm sorry. I'll- I'll call you Ayumu like you said. It's not good to think about things that- that feel wrong in this place. [It's the best, if most halting warning he can give her, because he doesn't quite know how shape words around it.]