A Quick Transmigration Story With a Beast World Arc, Where the Snake Male Lead Is Saved by the Heroine, Who Goes to Him of Her Own Accord

In the beast-world setting, the female lead comes from a small tribe, while the male lead is a snake person from a large tribe. Her tribe doesn't want to marry her off to him, so the two tribes go to war. But before the war even begins, she secretly leaves to find the male lead, entirely of her own free will.