Sarawareta Junketsu no Hanayome

Ordinary Briar Harcourt is horrified to discover her life is a lie—she is in fact a long-lost princess, sent into hiding to escape a forced marriage to a brutal king. But now his son, Prince Felipe, has found Briar and is determined to claim her as his bride! Marriage to Briar will give Felipe the power he was born for: her compliance is nonnegotiable. But his searing, uncontrollable desire for her is unexpected…and he’ll use all his formidable charisma to seduce her into surrender! Source: Harlequin