Yes. Yes she is, I can assure you of that. 100%.
We started the exact same way about 7 yrs ago. When I began to realize that she had this as a fantasy, I began to "dirty talk" while doing the exact same thing that you are doing. I gave the Dildo a man's name, asked her how she liked fucking him while she sucked me off (even tho it was just a dildo). We did this occasionally for almost a year before I began some pillow talk about the real thing. We had to lay down some "rules" before hand, but eventually we began a 5 year relationship with a buddy of mine. We almost always did a MFM with her, but occasionally he would come over and have her to himself while I stayed in the den watching TV, but mostly we had MFM threesomes for about 5 years. Did it maybe once or twice every few months over that time. My buddy (Derrick) even went with us both on a vacation to Vegas once. He eventually married someone else and moved away. We have not had any more experiences in about a year, but we are talking about maybe having someone else join. In essence, you are at the same stage we were at in 2015...