Are you saying I've screwed up the Yukki/Amano diaries and names? nothing easier
It's just that the Amano name doesn't ring any bell in my memories, except when Murmur leaked to Yukiteru Yuno's sin (Just remembered). So I assumed that Yuno didn't ever call him Amano-kun along the series.
This is the problem to start guessing so late in a series. I forgot too many things.