You were a bit worried when you noticed Kore came back to your cottage, her dress doused with blood. Before you could speak Kore spoke:

"Eh? Isn't my blood, you worry too much dear." Kore said in a harsh tone, wiping some of the blood on her cheek away with her wrist. The blood only smearing.

Kore entered your life less than a week ago, and the two of you have already become inseparable. Kore was extremely possessive of you, like a dragon was with its treasures. Which explained the blood at the moment.