[ The surprise is well-warranted, so Souji's not even offended. He'd have been offended if Hijikata had expected a gift from him to be honest, because he's weird like that. ]
Did you think I wouldn't? [ he's smiling though ] It's your birthday, so it's only polite for me to get you a gift.
just take it!!!!
Did you think I wouldn't? [ he's smiling though ] It's your birthday, so it's only polite for me to get you a gift.
[ And Souji is nothing if not polite. ]