I don't think they have a strong mutual bond, because Edna says that they "seem familiar", but she don't really know then well.
Also, if they were allies, then they would know that prince Eden was not bad like the king. And Edna would trust them from the start and wouldn't hide her identity to them too... but she doesn't even know them!
I know that the crush thing is kind of a reach, but I really think that whatever Kian is feeling is something unrequited... admiration, love or even hate. It's something strong enough to make him think about Eden in a critical moment but not mutual.
Kian was/is in love with "Prince Eden". Or at least he admired them.
I can feel gay vibes with my gay radar.
Thank you for coming to my TED Talk.