When talking about the beds, there's extra dialogue depending on your relationship level with several of the characters. It's a hidden value, but this is a soft way of knowing if your relationship level is over 6. Isabellas like of you is tracked by how many people you've eaten.
As for the devour stuff, I've been trying to add more options for it. And trying to come up with narrative ways to get that hunger idea across. Been difficult to say the least.
Not sure about a Nessie party member though, she's got a unique design that doesn't quite fit well with the battler maker in the program I'm using. Other than that she has most of her assets ready.