Using Two of our Fingers Together Inside Her

I previously wrote the April 11 story, Favorite Love Hotel Memory. My wife and I do this in bed sometimes, and I thought I'd share. From time to time, I'll stick my middle finger up my wife's pussy, and then have her stick her middle finger up inside herself, too. Sometimes we finger her pussy together, but mostly I just keep my finger underneath hers and feel her as she fingers herself. I can feel everything she does, and it's incredibly erotic feeling her wiggle her finger against mine inside of her own pussy. What she does with herself wasn't quite what I thought she was doing, either. I thought she was putting her finger straight back inside her tunnel, but she mostly curves it up towards her G-spot. It's a very fun way to play, but I don't recall reading any stories about people doing it. Does anyone else do this?