My (27m) gf (29f) fantasizes about group sex with my friends

My gf of 1 calendar year and me were speaking about fantasies and I shared mine that I have always believed it will be nude to have sex in a risky place like elevator or in a car in traffic. And then the girl shared hers and frankly it took out the wind from my sails.

So I have small group of friends whom I see as soon as every two weeks (4 men including me) and we normally gather at either my own or my best friend' s place and have dinner and just talk till past due at night. Most of times the partners also accompany us. And this was connected to the gf' s fantasy. She said she wanted to end up being on the table with food all over her body which we are going to eat and then all of us have got our way with the girl. To say I was shocked to hear this would be an understatement, the jaw almost hit the floor. She must have noticed since she immediately said the just a fantasy and not something she would ever want to try even when I was up for it.

Yet this has shook me to the core. I see those guys as brothers and her fantasy involves them. The lady might as well have said the lady wanted to have sex with the elder brother. I do not know how to get over it and I am actually dreading going over there this weekend with her. It will be so uncomfortable. Any advice on how to get over the top of it and stop the mind movies?

Edit/Update- So we talked again in more detail and she said she doesnt actually wants to have sex with my friends, it was just a imagination which she will never wish to turn into reality. It was just supposed to be like dirty speak but she got carried away and blurted out the specifics. She also mentioned she completely understands the reason why I feel weird and if I talked in the same way about the girl friends she would be weirded out too. But the lady never ever wants to make it a reality. I am feeling a little much better I guess. Also I have determined that we will go to the next supper, she said we can neglect it or I can proceed alone and she will realize. But as someone within the comments suggested, its preferable to go and see everyone behaving normally rather than keep having these porn like brain movies. So we decided we are going to attend together. Hopefully it is going to put my mind comfortable too.

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