Saeril gently placed her free hand on Kili's shoulder when he mentioned his love for her, having to return the acknowledgement with the warm gesture of a smile. Fili chuckled with them, and kept his grip gentle upon Yavanna's hand. 

However, upon hearing the princess' observation, the blonde and Saeril looked up as well. "Erebor! The Lonely Mountain. The last of the Great Dwarf Kingdoms of Middle-earth", Gandalf explained. "Our home", Fili breathed out in astonishment. A bird starts to fly towards the mountain. "A raven! The birds are returning!", Dwalin exclaimed when it flew by. 

"That, my dear Dwalin, is a thrush", Gandalf corrected him, pleased however as it was just the bird that they needed to fly past. The thrush would be the one to show them the hidden door.