Thanks! Great suggestion too! And we are actually planning another trip for late April of next year. Until then I definitely plan on using the idea of a MMF threesome in the bedroom more and more. She absolutely loves the extra thickness that my extension sleeves provide and is learning (slowly) to take the large suction cup dildo that I bought.
After I take off the sleeves we always talk about how stretched out she feels and how its like she's just been with another guy. The suction cup toy is, as I said, slower going but I know that once she gets into the habit of it and what it does to her pussy she'll love using it and it will give her the experience of having two holes filled at the same time
Another not so subtle hint at what I'm aiming for with the real thing!