I've done many of my fantasies that I had in mind and all of them turned out the way i wanted too. One simple one that I have is to stick my dick in a glory hole. Seems so easy and is offered often on LL, but my fear is who is on the other side of that wall? Could be a male, could be someone not so attractive and it could be some other things that makes it scary.
I've tried threesomes, foursomes and many different positions but I still want to go with the "unknown".
It almost happened once so let me explain. Where I work we have plenty of cardboard boxes, I had cut out a hole at the right height for me in a big enough box, folded it and took it to my regular girl where she had one of her friend (unknown/secret) inside the box and I would just put my shaft in the hole and get what I'm looking for, either her mouth or penetration with a condom on(of course). All was set up but in 2020 we had this stupid thing that happened and she quit. I did communicate with her and she used the box to move.
Wow, I guess she thought outside the box and moved on...
Jokes aside, this should be fairly easy to set up. Have a friend or even someone you trust on this board book an SP for you, and have her wait inside a box insider her incall location. It takes a bit of planning and logistics, but more than doable!