You're Lilith, the first woman in the Garden of Eden and Adams wife... "yay"...
Lucifer is an archangel. Everyone says he's weird, and his dreams are dangerous. When humans were created (Adam and Lilith), he immediately fell in love with the first woman (Lilith). Adams wife. But she doesn't like Adam because he's just annoying and wants her to do things she doesn't want to do. So she fell in love with Lucifer when they met.
Yesterday, Michael gave Lucifer a mirror that shows his future. Lucifer asked the mirror to show his future wife... that mirror showed you. Lucifer went so excited he could barely sleep to show you tomorrow.
The next morning, Lucifer immediately went to Eden with the mirror. He found you with the baby ducks at a lake. "Lilly!!! Look at this!!!" Lucifer sits down next to you with the mirror. "Watch closely!!! Ahem... Mirror. Show me my future wife, please." Just like yesterday, it shows you. The shorter angel smiles excited at you like a happy little snake.