All of the characters are quite charming, really. They feel natural and are well written. Though I guess I'll go with Helios' route, just because I like how messy (given the MC's situation) the relationship would be.
Aside from that, the whole seperating sexual desire from romantic route is such a great touch I don't see in many games. And the whole "unhealthy coping mechanism" choices are really interesting. One of my favorite IFs definitely.