I translated this page, will try to translate some more. I know very little Japanese, and I'm not even a native English speaker, so if anyone spots amy mistakes, or finds a way to word something better, feel free to improve the translation. 4649. (Moonspeaker where are you in our time of need? :) Seriously though, thanks to all the translators whose work allowed me to read this story untill here. And of course, to the artist.)
Well, actually they are not siblings canonically but they are "mirror images" not twins, the idea that they are siblings are from the fandom but is not the original idea, also canonically they are not lovers if you thought that.