Jerna was a submissive for a Master he respected, but I'm not sure he really loved. Even if the Master, Kimis, fulfilled Jerna's need to be dominated, it didn't satisfy his desire to have a family, to have child, and all the other ordinary things of life. Life with Kimis was mundane and good, but not complete. Jerna left Kimis to marry Tyrme, a good woman who, in all the novel, will always have a positive role; but to me Tyrme seems more a good friend, a loving companion, but not a lover. To Jerna's eyes, Tyrme is a whole with their daughters and family, when Jerna is torn apart from them, never once he says he misses Tyrme as individual, but instead he always mourns for his family. With this, I'm not saying that Jerna doesn't love Tyrme, I'm only saying that, as Kimis didn't fulfil every Jerna's need, so it doesn't Tyrme. In a way, Jerna passed from a Master to another, Tyrme is a very authoritative woman, quite the one who leads the family, but he hasn't still found the right one.
When Jerna is framed with a crime he didn't commit, he is forced to divorce from Tyrme and sent to prison. Jerna is a strong man, even if a submissive, and he faces the trial of prison and all the violence inside (also rape), with a strength that seems impossible. It's not a body strength, more a strong will and maybe also something that he learnt from his training as submissive. From the prison Jerna ends to be an endured servant in a brothel, and this means also being a whore: in his mind Jerna doesn't see it as a betray towards Tyrme, since it's only his body involved, not his mind, and above all not his heart.
All above changes when Jerna meets Ria; at first Ria is an untrained Master, who in his fight to find an outlet to his desire to dominate makes more damage than nothing. Ria is not a bad man, but he is not trained. The first bad experience between Ria and Jerna, I believe, is not all Ria's fault. It's true, he is untrained, but Jerna, from his side, has a bit of an aloof attitude, something he has always had from the first. Nor with Kimis or with Tyrme, whom in a way Jerna considers Master, Jerna has ever let this attitude down; he submits with his body, but deep inside, I think he still believes to be superior to them. Same attitude with Ria, even if maybe in this case he is more right than not. Anyway this leads to Jerna to agree to be Ria's teacher, to teach him how to be a good Master. Jerna starts it thinking to teach something to Ria, but I think that, in the end, also Jerna will learn a lesson, and maybe for the first time, he will find the right Master... one who he himself trained to the role. So yes, if someone was wondering why the "remastering Jerna" of the title, when apparently it was Jerna who was remastering Ria, this is the answer: both Ria than Jerna will learn that it's not enough to know how to do a BDSM scene, to have a real D/s relationship it's needed something more.
Amazon: Remastering Jerna