When I heard Iroh sing this song the first time, I always wished there was more to it. Your extension is very well written and actually makes sense and flows. Good job! :)

This is beautiful! It's a good song to focus on (I plan to have Iroh sing it at a wedding - I won't say whose - in one of my stories), and your continuation is perfect! It's so poetic, and actually has a connection between love and each of the seasons, something not really explained in the original song. It reminds me a little bit of my haiku series, including some about the seasons.

You might want to separate the stanzas better. You can do single-space instead of -double space by pressing "Shift" when you hit "Return".