The whole gist of Shohei's dmc au that lives inside my head is Vergil being put into the torment nexus of experiencing fatherhood/mentorship with a real kid (Shohei) while trying to mend his relationship with his Actual kid who is now an adult (Nero) who judges how he interacts with said kid
The character arc for Vergil here was always meant for him to further deepen his connection with humanity by making him walk amongst mankind. Shohei's presence quickens the process by being a really snappy teenager (nothing is more humbling than dealing with a scary teen)
This is probably the plot for DMC6 😂