This book, by Derrick Andrew Richter with a cover photograph by Conor Sathre, is available as a paperback or as an eBook:

Barron and Cody, partners of two years, begin to explore an alternative lifestyle. Cody readily jumps at the chance to try new things. While Barron, the more dominant partner, is initially more shy about exploring his fantasies. Together they learn the joys of new experiences. Cody quickly embraces the role of pup. But it takes a stronger hand, to help push Barron into acting on his deeply hidden desires. This story is a sexually charged, exploring roleplay, fetishes and consensual humiliation.

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