The purpose of this passage appears to be describing how Leo, likely a friend or mentor, had a positive influence on the speaker by teaching them to reveal their true self, to wonder, and to laugh more freely. The passage highlights the transformative impact of Leo's influence, allowing the speaker to express their sense of humor more openly and to be less introverted and timid. It emphasizes a significant moment in the speaker's life when they were able to laugh out loud for the first time, suggesting personal growth and increased self-confidence.