One long Orgasm and draining

I am a Senior man. My wonderful wife and I were fucking and I was in a standing position and she was laying on her back. I was pounding her and holding her legs apart. On occasions,I like to pull back and cum shallow just inside her pussy lips. So I pulled back and started to cum. Too my surprise I had one spasm(rope). I continued to cum and orgasm. It was pure erotic to watch my cum continue to pour out. Did not shoot out,but a complete draining of cum.
I usually have 3-4 ropes and then dribble.
We do have sex atlest 3 times weekly.
This was a real good orgasm. Has this happened to others? Wish I could recreate it. What say you men and women?