Board Thread:Fun and Games/@comment-27524978-20160317154321/@comment-26814804-20160520025704

Agreed. He wouldn't smack-talk his brother, at least not with such biting sarcasm. I think he's dead serious.

Either way, like when after you kill everyone but him and Sans, he really does care, and Sans obviously cares about him. Just like he is proud of you when you give up Genocide, he's proud of Sans when he gives up laziness.