Yearning, I have a piece in the works discussing this and open relationships or polyamorous relationships coming soon. I'll factor your comment here into my work and research to see if I can perhaps help clear things up in terms of your conflict.

I'm not sure if you like personalized stories describing it from within, but I'll add one below, so you can see if it's for you.

Honestly, it's such an incredible experience. Feel free to reach out if you need any pointers or need to discuss things. I'm here. :)

https://medium.com/sexography/whats-a-heterosexual-threesome-with-two-guys-really-like-dc294710461e