I'm sure it was not an overreaction... ah, that's right. Friendship and close relationships... they often make a lot of lines blurry and very easy to cross, don't they... [ She says that as though she adds "And I'm speaking from experience" without outright saying it. But oh cute hiding his moe blush... she does that thing when she hides her smile again, because so cute... ]

...Anyway, I think this is the first time I've seen Marco-san make that sort of face.