I want Teto-chan to feel inferior because of Miku-chan, but Miku-chan is kind, so I want her to love Teto-chan, who is a bit like her, and I want her to like Miku-chan. It would be even better if Teto-chan was a human with all sorts of emotions.
I'm pretty sure the artist split up the quests between Florian and Juliana. So Juliana did Nemona and Arven's storylines (and likes both of them romantically), while Florian did Penny's and the DLC. So Florian was never all that close to Arven, but doesn't hate him or anything.