Written as a letter to someone named Parker, the poem is a speaker's private attempt to say what they can't say aloud. They are fascinated by Parker, who seems to have "chosen to stay young" while everyone else is expected to grow up. The speaker peppers them with questions: what was their childhood like, what are they thinking when they stare at the table, who is the "ideal friend" in their head?
Underneath the curiosity is real devotion. The speaker says they would save Parker over an old friend "over and over and over again," because talking to them feels special and a little risky. That risk is the heart of the poem. The two are so different that one wrong word could end things, and the speaker hints it has happened before.
So the poem ends in fear rather than confidence. The speaker won't show Parker the poem, dreading a look that triggers panic. The mood is tender, anxious, and vulnerable, and the final "Hang on" reads as a quiet plea to stay.