PARROT's manga / #Incest(4)

Uke hates his twin brother so he pushes him down the stairs, which ends up killing him. Even after his brother’s death he’s still trapped in his shadow. Fast forward he ends up in a relationship with his brother’s favorite author who also only sees his brother, but plot twist the author digs up his brother’s grave, takes a bone, does some supernatural stuff that allows the two brothers to mind fuck(?) basically