I'm just going to do you all a favor so I can stop getting comments about people not wanting to continue the fic because of implied KaeLuc.
This is a KaeBedo fic with unrequited KaeLuc (on Kaeya's part).
They are adopted brothers in this fic, and Kaeya has very strong feelings for Diluc that he mistakes for love because of a childhood event.
This is not a KaeLuc fic.
I would think the obvious Kaeya and Albedo on the cover would let people know this but apparently just Albedo asking the question (in chapter 2 I think) "Do you love your brother?" is creeping people out. They are ADOPTED brothers in this fic, just like in canon, and whether or not you ship KaeLuc shouldn't matter because
Once Again
Kaeya and Albedo end up together because this is
Say it with me now
A KAEBEDO FIC
If KaeLuc in any way makes you uncomfortable, this story doesn't impact the rest of the Build a Boyfriend series that I have made. I did this on purpose so people that found KaeLuc uncomfortable for whatever reason didn't have to force themselves to read this.
If you'd like to read this, have fun, if you would rather skip to Part 3 (Kazuha x Xiao) have fun.
This has been your public service announcement.