Prince of Seas
Book 1, Three Brothers Fair
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Prince Felimid wants nothing more than to have a kelpie in his family so that his own race will have some stronger blood to mix in and have a hope of keeping water demons from dying out altogether.
What he gets is a shy, sneaky, and virginal kelpie whose seed has yet to be proven. Initially furious that he's been tricked, Felimid can't deny the courageous and lusty husband he's accidentally won.