Well, I've always been one who just enjoyed the fun flings. I never really had rules on the matter and I just went where things would take me.
I think that dying does make us re-evaluate our lives. I mean... it's death and is supposed to be final. Add in being in a new place and trying to adjust, I can maybe see that? Maybe? Or like you said, you like what you have. If she's not pushing for a relationship, then it shouldn't be a concern right now. I'm all for experiencing things and living.
And that rules are often meant to be broken. So what if you have a normal rule of one time only. It doesn't have to be serious if neither of you want it to be. Just see what happens.