Julian didn't recognize Jono either, which caused him to give Jono a long look. Julian didn't share classes with any of his agemates, so not recognizing Jono wasn't unusual.
"What's Pietro got to do with anything?" Oh, Julian knew the kitten was obvious at this distance, but 'ask me no questions and I'll tell you no lies' applied. One hand remained on his stomach to keep the kitten from spilling onto the floor, as something suspiciously mouth shaped attempted to bite his fingers through his shirt. The other went into his pocket and yes, Julian did pull off nonchalantly having a kitten in his clothes.