Someone already said it in the comments. But, the ML I think is one of the more psycho psychos. Most tops would be like I like to see you suffer.
But after the bottom was caught after running away. The top had him explain his situation, of how his father dying was his fault. And the top was jerking off the whole time.
I think it grossed me out because it's the most visual version of your emotional pain turns me on I ever seen.
I thought at first maybe it was just the description of murder, but maybe it's because everyone is fake around the top and this moment seemed so sincere. That's what it seemed like when they would do it and the top sensed some fakeness. But still, rude and weird.

"He's sympathising with a peasant like me" PLEASE STAND UP OH MY GOD