Admittedly, I can't speak, read, or write Japanese. But: Einhart: "Kore ga Vivio-chan no (and then kanji I can't interpret)." Vivio: "Nan ka Einhart-chan no (and more kanji I can't interpret)~" Rio & Corona are in the background going, "Uuoooh (sfx in black) & Kyaaa! (sfx in red)" & Vivio is stuttering in surprise, "Suuhaa, Suuhaa (sfx in black)".
I can only imagine that Einhart is saying something about Vivio's body & Vivio is asking why Einhart is going there while their friends squeal in scandalous delight.
