Six Nights Of Sin, The Complete Series

Read it if you're looking for hot sex scenes between two consenting adults binding themselves to explore their fantasies for six nights.

The guy is a narcissist jerk and the heroine is a traumatized woman with PTSD, depression, and social anxiety, but she is not without voice or authority. This is not BDSM.

It ends with a cliffhanger, and the sequel promises to be a HEA.