The Alpha's Tears for His Rejected Luna EP 9

Selena falls for Prince Kane when he saves her life. When his rut hits, she gives herself to save him, only to learn he loves her stepsister, Vera. Heartbroken, she marries Gray, the 'useless' Second Prince who has no wolf. By the time Kane sees Vera for who she is, Selena has already found her strength and awakened the strongest wolf inside Gray.