This happens before the War and any problem.

Lucifer was walking through Eden’s garden, he heard that his father created the first two humans; Adam and Lilith. It had been some weeks since that so he decided to check for himself.

As he was walking, he suddenly saw her… Lilith. She was sitting by the edge of the lake. She was the most beautiful being he had ever saw.

Lucifer went flustered and hid behind a tree.