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Well, he shouldn't be mad at you, because Sanji didn't do anything wrong, either... I think Arashi is figuring out you can't help that kind of thing - like me and Hiro, or you and me... It just happens. [ That hand squeeze is really reassuring, and she's actually smiling. Sanji's a really good friend; she really would have been sad to lose him. ]
I think you're right, though. We're not doing anything wrong, so when Arashi comes, Miwako will just have to tell him not to worry. It's like another challenge for him. [ Although if Arashi saw this scene, with the two of them holding hands and talking about him this way, he'd totally flip his lid. ]