after a while of living with L you have gotten use to him.  Even thought of him as your big brother, he was right now still working on the Kira case, he wouldn't sleep until Kira was put to an end.  You were right now playing with your toy train when suddenly L came running in with a bunch of different police men.

"L who is this?"
A police asked L.

L sighed and picked me up.
"My little 'sister' well not really but I think of her as my little sister. Her name's Y/N." He said, to the men.

The men nodded and smiled at you nicely.
You giggled and clapped your hands when they did this.
"She's so cute." One of the policeman said, happily smiling at you.

"Yep she is." L said.