Ultra cute! This hits right in the kokoro. Triple kill for our boy.
P.s. I guess this whole pornmag story will be haunting him for years at the future family dinners, and onee-san will be like "I remember this schoolboy reading pornmag at the store and thinking how funny he was and now he is my brother-in-law, who knew, right?" - Shirashi-kun - doomed to be eased for his while life by the Kubo family. 😂