[He nods to Ayato, that's exactly what he would have suggested as well, so he's glad that they're both on the same page.]

It's probably best that not only we don't tell her the other will be there, but the other stays hidden for a few moments to let one of us do a little questioning first. I think I can safely say the person hiding should probably be me.

[He may be friends with Lumine, but he's still Fatui, and no one lets him forget that. She might be cross with him for some time after this, but he's already deemed it as something he'll just have to deal with the consequences of. He'll figure out a way to make it up to her later.]

I think this will work out well- it's not usually my style, but I think we both know exactly who we're dealing with here.