Ang Bastard Princess at Doomsday Dragon

Lyra Vesland carries both royal and dragon blood, but she has lived in hiding as a bastard daughter of the crown. When a fragile peace treaty demands a bride, she is dispatched in disguise as a false match for a powerful lord. Her new marriage places her at the center of old grudges and a fragile alliance, and every step forward risks exposing the secret she has kept her whole life.