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This one is quite rare of omega x alpha story, usually the effect that omega gives isn't that strong, to the point people from one house affected by it, and in the last part, the omega, he looks like turned into some kind of medusa or something, usually the omega look so weak and always look like a victim who can't speak up for whatever done to him. I kinda like this one, especially that last chapter (3.5)..
I bet the two butler, Kudou and Miyauchi, gonna hooked up later
Somehow I like it better when the twin do it together (without the big brother), it was cute.. well, I never really like threesome after all..