Yes, Werner and Marie-Laure do kiss in the story All the Light We Cannot See.
Their encounter takes place during the concluding events of the narrative. After Werner and Marie-Laure met, they shared a kiss. This moment was followed by Werner's promise to Marie-Laure that they could eventually reunite, provided she continued her radio broadcasts. Soon after making this promise, Werner surrendered and was subsequently taken into custody by American troops. This brief but impactful interaction highlights a significant, albeit short-lived, connection between the two characters amidst the circumstances of the story.
