I think that the feelings between Rune and Devon is like "more than friends, but not lovers." I haven't read Broken Harbours, but I have doubt that the relationship between them is complicated, not like normal relationships that we usually thought. From my standpoint, in both Rune and Devon's route in Dawn Chorus, Arvo (the main character) seems like a "third person crashing." Playing Rune's route, this appearance of Broken Harbours makes me think that Rune in Dawn Chorus is in a state of confusion if he has love feelings for Coach Devon, like "I love him, but Arvo is the one comforting me when I'm unfortunately sinking in the darkest time right on a five-day camp. Do I really love him? Or Arvo the one?" For Devon's Route, the confusion is whether the leopard again seeking a love relationship with another student of his, Arvo, or is just another portion like with Rune, and Rune in Devon's Route seems like a nearly jealous man toward Arvo.
The thing makes me confuse myself is the Dawn Chorus's prologue and Arvo's dream. It seems that Rune would seek a loving relationship with Arvo. But is it a Deja vu, or is it a strange dream which is not happening in the reality? The game's name, "Dawn Chorus", is a song of birds in the early morning. The birds sing, then fly away having completed alarming a new day. Would this is a sign that Rune or Devon in the respective route would go on to seek a new future with Arvo, or Arvo the one help them stabilize their feeling toward each other? Or, five days is just five days, and then they would be completely strangers like a poem sentence as far as I remember was "I would do anything for just a moment of this"?
Sorry for talking too much about Dawn Chorus here without buying Broken Harbours, and my bad English, too.