I THINK ABOUT THAT ALL THE TIME!! they always talk to eachother in a language only they understand in a country thats across the world from france, and its not only the french language i think its literally a methaphor to say that only they understand eachother in this intimate way including any other thought, feeling and action they do, like when your person gives you a look and only you know what it means without a single word being spoken (=・ω・=)

To think that they are both talking in French when they are going all out.. especially the I love you...