There is a relationship between the sand and the water. Not just basic sand. Or water poured into it. But lake, river or sea sand.
Staying next to something or someone for a long time. Brings unexplained attachment. And feelings.... Beautiful connections and affection. It happens to non humans too.
Though the sand on the shore isn't as lucky As that at the bottom, It still gets it turn. On calm days... It seats ignored.. The water pretending not to care..
But rough days come through.... When the water cant pretend no more. And it gives in to the reality. That just like the sand. Its tired of being lonely...
That's when its waves visit the sand. And sweep it to the bottom of the sea.... To live happily ever after...