You guys are awesome! Thank you all for your opinions and support. I think you guys have reached a consensus and I like the results.
I'm going to let her lead the conversation and continue my relaxed attitude as a caring friend. I'm not going to push the conversation, especially to any R talk. If and when she brings talk of papers up (unfortunately this is inevitable) after we speak about those things I will casually mention that he has relocated to Seattle and is staying with me until he gets settled. Then monitor for results. If she seems upset or concerned I will ask her opinion on it and listen first.
Then I will decided what to do or say. My vibe and attitude will be one of being relaxed and openess. I'm not going to make it a big deal because it will then be a big deal.
I think her assuming we will be rolling around doing what we used to do when we were single would be enough. I'm prepared for her to be non-chalant about it and act like she doesn't care. Another, I don't care what you do comment. If she doesn't then all the better. If she actually says somthing else, all the better, but I'm not expecting that.
