This is going to sound stupid but here goes...
I'll say first of all because you are an impartial reader and critique (or at least try to be). When you read my work, especially deep, tragic and/or personal works, you do your very best to see from an objective angle. Even if what you are reading is something that would be offensive to you, you show as little bias as possible, and that's really helpful, because I think we all need someone to just speak the truth, and not just give a two word reply like "Not bad", or whatever.
Along with that, your twin is pretty boss. I assumed it ran in the family, so why not get a double dosage of awesome twin sister power? Not comparing or exalting one over the other (there shall be no sibling rivalries on my account). I do look forward to reading more of your works and exchanging and enjoying great and sincere feedback.
Hope that was sufficient. ^^