Someday maybe she will explore taking charge of your ass-cunt. Hope it happens. Not many fantasies left for me, the only things are a prolapse bigger than dirtygardengirls, my useless balls and epty sack removed and getting finger fucked or fucked by a hermaphrodite in the stretched out hole in my cock. My crazy wife wants ti prolapse her uterus some day and hvae her tits reach her knees instead of just past her waist, but we'll see, anything is possible.
If you can get her to, she is in for a treat. What might help is see if she will help clean you out and start with just a finger, or two. Then teach her to massage your prostate while on your back and she can watch you cum without an orgasm, maybe even suck your cock as she finger fucks you. It is also an easy way to have a flaccid (limp) orgasm. You never know, she might end up looking foreword to returning "fisting favors".