Hmmm... almost certainly her pussy, because that way I get to give her oral first!

I suppose I COULD do the same with anal, but my wife only likes that in doggy. And as much as I'd want to start with her mouth, if she's got her eyes closed, I'm thinking it might not go well. I know frem years of experience that she'll never complain if she feels my mouth and tongue working their way down her body...