ok but seriously why did he get hard????

frl is it bc he killed him and it got him excited or smth??

Taking into account real serial killers throughout history- psychological studies have shown that for these serial killers, there’s a connection between killing and sexual gratification. All the famous murderers you may have ever heard of, the majority of criminal psychologists will talk about their motivation being said sexual gratification. With that said, it’s very common.
I think that might be what they’re getting at here…
That, or I mean, it’s a yaoi so maybe they just need a reason to fuck LMAO