My first threesome came from a girl that I had a crush on in Highschool. See if you have any social capital built up from your prior years that you can draw upon. First day was kissing -> sex -> anal. She suggested anal, and that day we did that in the shower. Second meetup was her coming to live at my house for two weeks. Third meetup was a threesome with her and one of her good slutty friends. It was an amazing experience!
However it came to an end the next morning because my girl was getting sloppy with birth control. I had to take her to get Plan B after only our third meetup and I was in grave fear of getting trapped by her with a baby. My amygdala was ringing alarm bells that it was purposeful, not accidental sloppiness and not even condoms can stop a sufficiently motivated and potentially crazy girl. So I stopped seeing and chatting with her — too risky. 11-12 months later, I found out via an Instagram that she just gave birth to a new baby girl. Her dad was in a separate but nearby city. He, nor his family were in good relations with her but she “always pictured herself having a baby and becoming a mother someday”. I had a wonderful experience with her, but I also narrowly dodged a bullet. All of this was found by just chatting with a girl that I had known years ago in Highschool. See if you have some social capital you can draw upon. If you do, I hope you are safe about it.