Not a Pawn by Jade Marshall

Twins Sebastian and Julian are fierce dragon shifters who’ve lived long, lonely years without a woman to share their hearts—or their secrets. When they rescue a mysterious woman, kidnapped to pay her father’s gambling debt, they realize she’s not just anyone. She’s their mate.
But their bond isn’t instantaneous. Despite the undeniable pull between them, Sebastian and Julian make a deal: she’ll work as their personal assistant for thirty days, giving her the time and space to understand the intensity of the connection they share.
Their fates are tied, and the stakes are higher than ever. With her arrival, their world will never be the same—but can they convince her that their bond is meant to last, or will the flames of destiny burn out before their time together truly begins?