in touhou 8, if you play with saku-remi, there's a famous dialoge: remi ask sakuya if she'd like to drink the immortality elixir, but sakuya answer no, that she want to serve her for all her human life,
there's a lot of dj that take this imput,
in this story remilia didn't respect the will of her servant, and sakuya loose her humanity and her mind