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...
Would probably read, 
even at the beach
،غالباً سيقرأ
حتّى في الشّاطئ
Würde selbst am Meer
noch lesen.
Incluso en la playa
se pondría a leer
Incluso en la playa
se pondría a leer
IL VA LIRE MÊME À LA PLAGE
Leggerebbe, 
anche se è al mare
Ficaria lendo,
mesmo na praia
Скорее всего,
будет читать даже на пляже