What the poem wants to express is love, the love between "I" and "you".
The home of birds is the sky, which means "you" is "my" home. Furthermore, there is a saying that "the feeling of love comes from the eyes." "If you try to close your eyes, love will turn into a drop of tears and stay in your heart forever." The poet used the metaphor of birds in the sky to say, " My" heart is in "your" eyes. From this we can understand the love in the hearts of two people.