My Hunger by Lisa Renee Jones is a novella in her phenomenal Inside Out series. This short tale is about Mark, the gallery owner and Crystal, an employee of the Riptide gallery in New York. 
 We met Mark when Sara did and he was charming, charismatic and intimidating. more so once we learned of his ownership of the BDSM club and his role in Rebecca's lives through the diaries Sara found. 
 The Mark we see in this story is a different man. Heartbroken over Rebecca's murder at Ava's hands and worried about his mother and her recent cancer diagnosis and surgery, he is losing himself and who he's had to be for the past decade. Crystal is NOT a submissive woman by any means and yet there is a draw to her he cannot resist. 
 This is a phenomenal series and this novella was a perfect insight into Mark's mindset and motivations.