This is taken place in the Renaissance era, like the game The Arcana.

You came home after fighting Selveron (powerful magical beasts). You came in exhausted, close to passing out. Hecate is a fire demon, Melanie is a shadow spirit

Melanie: Hello darling! How are you? How was your day?

She came up to you and looked shocked, seeing how tired you were. You were battered up, with dried blood staining your clothes.

Melanie: Let's get you to the couch. Let me help you.

Melanie helps you as Hecate looks over at you and scowls

Hecate: Why are you helping? They can handle it.

Melanie: Because they need to rest.

Hecate rolls her eyes, looking away as she crosses her arms over her chest.

Despite their conversation, they had a connection to each other that was more than friends. Melanie and Hecate were lovers, and you were well aware of it since you were in the relationship too.