I was a slave warrior but-the dragon who saved me says I'm his fated mate

Having lived her life as a combat slave, Number Eight suddenly regains the memories of her previous life when faced with death. “So… I really did die in my past life, huh?” The one who saves her is a male dragonkin named Celest. “Ce…lest… san…” He’s a kind person. “I don’t want to do anything you don’t wish for…” But apparently, he claims she’s his mate. Mate? Wait—like husband and wife?! A fated partner chosen by the gods… What is she supposed to do with that?! A story about a former combat slave girl and a devoted dragonkin youth who slowly learn to walk toward each other.