I don't have the exact episode in mind. But it could be when Rachel shows interest or when Joey feels it's the right time to pass on the story. Sometimes it just happens spontaneously in the context of their friendship.
Yes, there are quite a few. You can find some on popular fanfiction websites. Just search for 'Joey Tribbiani and Rachel Green love' and you'll likely come across some interesting stories.
Ross would probably be really shocked and a bit jealous at first. He might have a hard time accepting it. Phoebe would be super excited and would probably offer to be like a spiritual guide for the baby. Chandler would make a lot of jokes about it, but deep down he'd be happy for them. Monica would be practical and start planning things like baby showers and making sure Rachel has all the right things for the pregnancy.
You can try websites like FanFiction.net or Archive of Our Own (AO3). They have a large collection of fanfictions, and you should be able to find some dedicated to Joey and Rachel's relationship.
One plot idea could be that Joey and Rachel initially panic when they find out about the pregnancy. They might struggle with how to tell their friends, especially Ross. Another could be that they decide to raise the baby together in a really unconventional way, like living in Joey's apartment and trying to combine their very different lifestyles. And perhaps they start to discover new sides of each other during the pregnancy journey.
Many fans who are into fanfiction about Joey and Rachel making love enjoy it because it adds a new dimension to the characters. It can make them seem more complex and human. On the other hand, there are fans who are uncomfortable with it. They feel that the show had a certain charm in its portrayal of relationships and that fanfiction that changes the nature of those relationships too much is not in the spirit of 'Friends'. But overall, it depends on the individual fan's perspective and what they are looking for in fan - created content.
There are many fanfictions out there. However, it's important to note that in the official 'Friends' series, their relationship was more of a complex friendship. But in fanfiction, some might explore how their relationship could have developed romantically and led to such an intimate moment. You can find these on various fanfiction websites by using relevant keywords in the search bar.
Joey could be an ordinary citizen who just happens to be in the wrong (or right) place at the wrong (or right) time and meets the Batfam. Maybe he's a journalist trying to get a scoop on the Batfam and ends up getting more than he bargained for.
Since I don't know the exact story, Rachel could be anyone. She could be a fictional character created for a novel, a real - life person that the storyteller knows personally, or just a name used in a parable.
Rachel Trapani could be a local figure in a particular town or city. Maybe she is known for her volunteer work and the 'Secret Story' could be about the real impact she has made through her selfless deeds, which are not widely known. It's also possible that she is an artist or a writer and the story is related to her creative process that she has kept private.