I was reading my fanfic and I noticed that Yuki is actually slowly accepting Lucas's death. Before she would always think of Lucas and cry every time she thinks of him, especially with Mara. But now, she is like finally accepting his death, and is slowly opening her heart. She even said in the battle with his clone that she's slowly moving on.
I feel like the one that changed it is her relationship with Tsunayoshi. A girl who was lost found a reason so live within that boy, to protect him.
However, there are still tint of longness and sadness of her for Lucas. She's still holding on for him. My philosophy teacher once said that once a person becomes suicidal, they will always carry it for the rest of their life. She may be having a reason to live but she's still longing for Lucas. But she will also later on accept everything, just trust.
Also the development of her relationship with Tsunayoshi. Before she just wants to use Tsunayoshi to die and just keep the plot going, then later it became Yuki being soft and warm to Tsunayoshi, and looking at him as someone she wants to protect.
I know I'm the one who wrote the fanfic but I actually just write them random. Then I realize what I wrote and their meanings days/weeks later. It's like I'm doing a puzzle but I'm the one solving. I'm actually surprise they make sense.