...you could start by being a little less antagonistic towards me.

[He should probably be a little more subtle about trying to win Rin's good favor here, but at this point, he's not really sure there's a need for it. He's no longer in such dire need for allies, and he had no pressing need to keep Rin around.]

[And yet here he was, taking care of Rin personally, putting his own health on the line... were he asked why go to so much effort and were forced to answer honestly, not even Mephisto himself would claim to know for sure.]

I don't have to be the villain of your story, you know. A single act of kindness may not be enough to outweigh the trials I've put you through in the past, but surely it's a good start.

[Nevermind that this all amounted to far more than a single act.]