>>>A reformed sex addict
Say what? A logline should describe the state of the character at the start of the story. According to your synopsis, he is anything but “reformed” at the start of the story.

>>>Matilda then tells him that to cure himself he must return to being her patient ? and become dependent upon her and submissive. With great difficulty, Sean agrees and surrenders to her control.

So Matilda seems to takes over the driver’s seat of the plot. Since she is dominating/manipulating him, why isn’t she the protagonist?

Frankly, I think a series centered around the manipulative female sex therapist with a rich, glamorous and kinky clientele would be more marketable than one about a sleazy schmuck, addicted to sex and the fantasy world of porn, who can be manipulated by other women.

Again (and ad nauseum,)I ask what for me is the fundamental question:? what is your story hook?? More specifically for this story, who is the story hook?? Who is the more interesting character for the long haul of a series??

But if you’re already locked into the script you’ve written., well…

My 2.5 cents worth.