Ah, nothing like the terror of starting up a new fic... veering off from Yu-Gi-Oh! to work on "fixing" Castlevania (animated series).
"Under the Milky Way" Summary: After the events of Lindenfeld, all Trevor and Sypha wanted was to return to the closest thing they had to "home," but Alucard has not fared well in their absence. "You wanted to save the world, remember?" " He also needed it. He needed us." Post S3 animation canon based.
Ch. 1: Step one, you say we need to talk
He walks, you say sit down, it's just a talk
On AO3:
https://archiveofourown.org/works/42179484/chapters/105898884On ffnet:
https://www.fanfiction.net/s/14145124/1/Under-the-Milky-Way