She's been rescued by hot alien twins. Taken back to their home planet. Now she's about to discover what being their Mate REALLY means! Cass Randall gave up command of the starship Luna to experience life on the alien world of Tharon, where every male is born with an identical twin. Under Tharan law, females are required to be submissive and each one must take a pair of dominant brothers as her mates. Her hosts Rhynn and Rhom introduce Cass to the sensual pleasures of spending her nights with not one but two lusty warriors and she discovers their dominance is wildly arousing. When they declare their love and ask her to celebrate their union with a formal Mating ceremony, Cass is thrilled - until she learns first hand all the ways males punish their female when she breaks the rules on the planet of Tharon! Punishing Their Mate is an MFM menage romance novella with a HEA. It includes spanking as well as other forms of discipline. It's a standalone story about Commander Cass Randall and Tharan warrior twins Rhynn and Rhom, first introduced in Book One: Their Captive Mate.