"... and her fisting me was the first time i experienced female ejaculation."
indeed, and essentially indescribable to those not in the know. I wouldn't use the word "fisting" however, that term is far too crude. Gentleness, patience, comfort, rhythm,, and knowing the terrain are all important facets.
Moreover, one finds that the nerves in the entire area become quite sensitive, making orgaspasm occur from very light touches where one would have never expected same to have been brought on by.