I think you'll find it pleasing to add an F6 in the second to last line as follows:

  And I long once [F6] more for [C] your em-[A7] brace...  

Assuming you're using a full 6-string thumbed F and your little finger is therefore unused, add the D note by placing your little finger on the second string, third fret to form F6.

Try it, you'll like it.

      - Mark