Flame-coloured! Now I feel stupid for not thinking about that...
I was having trouble ending the last one. Other options were "Worse yet, she calls me her son." or
"She keeps me instead as her “son”."
The tone would probably have shifted if I kept it as "lover" as originally intended... In one hand, 'lover' could have terrible implications and the mind quickly goes for the most obvious story behind the scene. In the other, for 'son', the story still remains vague and has tons of potential to grow. However, I can't gauge which one is a better hook-- one where you already have a suspicion of what the story is, or one where you have to delve deeper to understand what's going on.

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I haven't played L4D, but I've read the wiki. I like the flow of your protagonist's train of thought. Really can imagine the witch sitting long before you even started describing her. ^^