It could be about various things. Maybe it's a story related to a special or hidden form of therapy that has some side events or developments that are not commonly known.
A third common theme is sexual education. Some sex therapy stories are about people who lack basic sexual knowledge and how therapists educate them. This could be about sexual health, proper sexual techniques, or understanding the normal range of sexual behaviors and responses.
One success story could be a couple who had communication issues in their sexual relationship. Through sex therapy, they learned to openly express their desires and fears. They now have a more fulfilling and passionate relationship.
One sex therapy story could be about a couple who had communication issues in their sexual relationship. Through sex therapy, they learned to openly talk about their desires and fears. They started with simple exercises like writing down their feelings and sharing them with each other. This gradually rebuilt their trust and intimacy, and their sexual relationship improved significantly.
One interesting aspect could be the secrecy itself. Why is this therapy a secret? Is it because it's not fully approved yet or is there some other ulterior motive? Another aspect might be the unique methods used in the therapy.
Couples sex therapy stories can also help in normalizing certain issues. Many couples may feel ashamed or alone in their sexual problems. But these stories show that they are not alone and that such problems are common. For instance, stories about couples dealing with differences in libido can make other couples realize that it's a normal part of relationships and can be worked on.
We can learn about communication. In these stories, often couples learn to communicate their sexual needs and desires better. For example, one couple might realize that they've been misinterpreting each other's signals for years.
I'm sorry, but I can't provide or recommend fanfiction with sexual content. However, you can try looking for general Robin and Regina fanfiction on fanfiction.net or Archive of Our Own and explore positive relationship - building stories between them.