I enjoy the fantasies

hi my name is sam and i have a girlfriend of 1 year i have been very open with her and i told her i picture her with other men while she says she would never cheat on me i definatley love the idea that she shared the same fantasies by talking about it while we have sex and such else. i have spoken to her about doing it for real but as i said she doesn't feel comfortable with that so i came up with an idea... find another male to come in a group chat together and i sit while you two talk about things together and maybe make plans. she said she liked the idea as it was a good way to test the water.