This thing needs subtility. If Kishi does the same thing as when minato came, then he'll ruin naruto's character again, making him look like a fool u_u
If it does get explained to him because he asks "How am I alive?" I can just....see it melting his heart. Not trying to be a paring*** but the way he's pined after her for years and considering his reaction when she fed him ramen?
If someone told him she beat his heart for him I see him going full blown confession mode.