Maybe when an incubus falls in love, they can't steal the soul or the soul only splinters, but doesn't like fully go? Cuz he was crying and in tears like he actually did it, so I think that he thinks he killed him.
I was thinking because he didn't "steal" the soul but was given it it didn't kill him.
Similar kind of logic to Stardust if you've seen the movie. .
woah, maybe something like that
maybe too!:00
kotaro’s still alive coz al prolly didn’t took away his soul (that’s why kotaro was questioning why was he still alive) and al lied to his fellow demon about finishing the test to save kotaro coz he love him so much;-;im looking forward for the next chapters, thank you uploader!