Page 3: "Hello-?"
My brain: "It's me. I was wondering if after all these years you'd like to meet..."
And I'm not even a fanboy of chart music (Adele can sing, though).
I liked this a lot. Actually, I've always liked the anime as well, cause like several others here, I wouldn't say it contains cheating in a strict sense. It's more a case of abuse (on the brother's part). Aaya has always been a bit on the weird side, and yes, the part where she holds Kii prisoner is fucked up, but what do you expect with her growing up in such difficult circumstances? I've always felt the series is supposed to show how her love for Kii heals her (something that is a rare thing in RL, but can happen).
That being said I'd say the doujinshi on the reader so far are meant to take place after the anime. This would mean they came back from that other planet and Aaya somehow lives on her own or with Kii-chan. That or the author simply doesn't really care about continuity and gives us only loosely connected episodes or AU stories. Which would also be fine.