Honey, you are looking on the wrong site for this type of activity. Even though many ladies cater to many fetishes, this is something more commonly played out in BDSM.
NOT in a provider/hobbyist world. It is usually done by a DOM to His sub (and NO, before you ask, my SIR would never let you fist me). If this is something that you are truly interested in trying, maybe you should take a look at
www.ALT.com or
www.FetLife.com. I learned years ago to never judge another person's Kinks. Good luck in fulfilling your fantasy, I just don't see it happening here.