Ah! Now I see what you meant. It's kind of a fanon thing. Just Google "Sans NSFW" and you'll see some pretty interesting images. He didn't exactly go soft on her, more along the lines of "Oh, look! This little thing is really amusing! Let's keep it around so I'm not bored until I finally get bored with it!" On top of that, the fact that she has a tail caught his interest, so that gave him a bit of pause on killing her. Plus, y'know, plot armour is going to protect the main protagonist until it's time to end things, so yeah. There's that. Now keeping her around for too long might result in him eventually, gradually growing a little soft on her and actually begin to see her as an actual person, but that depends on how things turn out as the story progresses because I have yet to decide whether I'll have him grow bored of her. As for my protagonist, the attraction never faded, it's just circumstantial and her mind is just "Let's see how much shit I can get away with before that shit hits the fan!" on the daily. She's attracted to him, but she's also still just straight up obsessed with Kaori. Well, her mind is just a weird place to begin with. I'm not sure how else to explain that, really. Maybe one of the next chapters will help with that, maybe not. I'm still working on things. Let's just say a whole bunch of weirdness factors into a lot of this. I hope you're able to get something out of my word soup of an explanation. I appreciate the input.