Half ass it, just stick the translations of those pages somewhere else or directly over the japanese text as long as it's readable. If it's a really good page though take your time.
I personally don't mind seeing some Japanese slip in here and there, but I don't have any strong feelings on the topic. Go with whichever is easier/feels right to you. As long as I get my entertaining ecchi trash I'm happy ^^
How is Takinami freaking out over the note Kanon picked up, as if she had no idea? I'll give her that it is a little creepy going down the real incest route, but to be this shocked about it now is a little unlike how the story has been presented.
@Lyanhyrt she probably surprised about the fact that her joke of Kanon loving her brother that Kanon want to marry him turn out to be true.. (yes, she was kinda joking or should I say teasing when she said it earlier. at least it seems that way to me)
She may have the feeling about it before (don't remember, been a while..), but it was never stated directly by Kanon.