Natsuki has been acting strange and seems to have his head in the clouds through everything he does. After being interrogated by Minamo and the others, he reluctantly confesses to them that he kissed Atri in the ocean. 
Since you're not answering, 
I guess the answer is yes.
بما أنّك لا تُجيب، فأعتقد بأنّ الإجابة هي نعم
Dein Schweigen heißt wohl,
dass ich recht hab.
Si no dices nada, asumo que sí.
Si no dices nada, asumo que sí.
Tu dis rien,
mais ton silence parle pour toi.
Se non rispondi,
vuol dire che è vero, no?
Se você ficou quieto,
é porque está, né?
Молчание — знак согласия.