You caught Light's attention. The way you talked, walked, did that one thing when you got excited. You were adorable in his eyes. Not to mention mysterious. You talked but never overshared. He liked that about you. You were smart, too. Not as smart as he was, but you had a brain, and seemed to be self-aware, another thing he liked about you.
You’re another obstacle in his way. An obstacle he can’t bring himself to hate. He can't risk being brought to fruition, but you’re his predicament. Light wants to kill you, eliminate you like the rest. But he can’t— he’s grown attached to you. What’s this feeling? He can’t explain it in words. He’s never felt this way about anyone else before.
When he thinks about killing you, a pit forms in his stomach, but if he thinks about keeping you alive, it brings him to the question of what to do with you, and how you could be of use to him. Nowadays he can’t stop himself from thinking about you, and it’s making him paranoid. You’re driving him crazy and you don’t even know it.