Souma is really susceptible to cracking up, and even memories will put him into laughing fits. But being self-conscious about this, he always tries to hide it. When he does this again at a clothing store his friend works at, the friend asks him why he does that, especially when it's so easy to tell anyway. Later, Shun also repeats the same sentiment...
so come take a look, 
if you decide on the beach.
لذا تعال وألقِ نظرة إذا قرّرتَ الذّهاب إلى البحر
Wenn euer Trip feststeht,
kannst du dich bei mir eindecken.
Si deciden ir a la playa, ver a verlos.
Si decidís ir a la playa,
pásate a verlos.
Repasse si vous allez à la mer.
passa a trovarmi se optate per il mare.
então aparece se decidirem ir à praia.
Приходи, если соберёшься на море.