Fili was very anxious, almost regretting on his decision to even bring his uncle into this situation. Worse, he'll see their godmother as a burden, and even make her leave. How could he explain that to Kili? If something was to blame, Thorin was gonna choose Gandalf. But the wizard only brought her along for a good cause, not because he just wanted to. But no, the blonde was gonna take the blame; he will willingly take it for both Delva, and Kili. 

As Saeril gave the youngest a light-hearted smile, her yellow-green eyes gazed upon Fili, and then to the Dwarven Prince in the doorway, behind him. Her smile faltering into an expression of slight fear, the she-elf backed away a little. The blonde tried to keep himself composed at the situation, but he was already regretting by the time he led Thorin completely into the room. Gandalf took notice of their gathering, and followed. "Uncle, this is--", just before he could say more, the wizard stepped in. "I'll handle this, Fili", he softly intterupted. With that, the blonde could finally breathe. "Thorin, this is Saeril, the last of the Elves of Fangorn, and the godmother to the heirs of Durin; and a friend of your family", he introduced the she-elf.