A succubus for the kings

Paltmin was born a human and grew up as such. His life was mundane, and he was happy with his simple existence. However, all that seemed to come to a crash when he was taken to the palace to serve the kings of the kingdom. And that was when his problem began. Paltmin's body underwent a sudden change the first time he met the werewolf Alpha, and that was the start of his erotic adventures. Note: This book is a reverse harem, meaning the main character has multiple partners.