Disclaimer: It isn't mine, and the money isn't mine either.
Desire
Thinking, when it isn't for a specific purpose, is dangerous. Lust knows that, but sometimes she can't help herself, sometimes the thoughts just keep coming and she can't shut them away. Homunculi aren't supposed to think like this. She shouldn't even want to.
She wonders why she does. Why she wants things, things she doesn't even know the names for. Why the plots and plans that sustain the others leave her so much less content. Why she longs to become human so intensely, more than any of the others, she thinks.
But then, lust is just another word for desire.