Where do we begin, you and I?

The casual talks, an instant ally.
Our ideas merge, and the sparks fly.
We pour the sand, mould it our way.
We cast our thoughts in an eloquent array.

How our dreams have come to life!
The castle stands tall without a strife!

How long do our paths pave?

We try to cease the hitting waves,
We hope to cover the flaw.
We add more sand to keep it still,
We cling on to the last straw.

Then, the highest tide comes by
Unbridled by both you and I
The surge of emotions, yours or mine?
Will our castle stand just fine?

Our vision blurs as the castle drowned.
Qualms and sorrow emerge all around.
The waves sublime, the sands flatten and dry.
Is this how it ends, you and I?