That cat seems traumatised since the beginning.
I thought that Yenna was mistreating him or something. He even gets more relaxed and starts purring after Orin scares the shit out of Yenna so... Yeah, that poor cat needs a new owner.
I you use Speak with Animals, the cat
tells you, they only trust Yenne. And when Yenna is gone, she only says 'Please don't look at me.'. So it seems, she was traumatised before Yenna, started to trust Yenna and was lost again, when Yenna is gone
I'm so sad, I can't help her.
