It's my hope to replace my fingers with my cock in the future so that me and the other guy are both fucking her pussy at the same time. As soon as I get that opportunity, I'm doing it.
I know what you mean! I remember the first time I did that with a couple, to feel his cock sliding in and out, and the sensation it brought to her caused her to start cumming quickly. It opened a new perspective on my preferences that has given me pleasure for decades.