These Demons Do it for Free

What does it mean to be sisters?

The first answer that comes to mind is, of course, blood-related female siblings.
Following that, another answer is a term used to refer to female devotees in a religious context.

However, it seems that neither of these cases applies to Lief’s mother and Costin.@@novelbin@@

Costin is a dragonkin, while Lief’s mother is human.
Alchemists are individuals who seek to change the world according to their will, so their religious beliefs tend to be weak.
Rather than being atheists, they are closer to being non-religious, with the few who believe in a god being significantly lower in number than mages.

So, the possibility remains that either Costin or Lief’s mother transformed their race through alchemy, or perhaps it’s highly unlikely that both of them were theists.
If it’s the latter, it would make sense.
In a field where atheism is the norm, theists gathering together might indeed foster a sense of sisterhood beyond racial lines.

“Did you believe in a religion?”

At my question, Costin snorted as if he had heard a ridiculous joke.

“Me? The leader standing at the forefront of alchemy? I have a decent sense of humor, but you should focus on your mana.”
“Shall we decide on a method?”
“A method?”
“Each time the mana increases, I’ll ask a question. If you don’t want to answer, you’ll need to increase the mana amount again.”
“Oh…”

Costin seemed intrigued by my suggestion, letting out a brief exclamation.

“Fine. But it’s double.”

Costin flicked his fingers and reiterated.