There is a female masturbation mod. But not for futa. She even "squirts" as well. I'll attach it. I think it's from modguy. Just add the mod to your character folder in the loader, load the char, and then hit N. Or you can place it in the $over$ folder so it works for every character.
I know it says 5.21C or whatever but it works on the current 5.22 loader as well.
Also if you want her to jack the guy off plus masturbate just set the proper hand for jerking him off. Left hand is her masturbation hand. Right hand is for jerking him off. Otherwise you can't do both.
EDIT: The pleasure bar for her is invisible though. But you'll soon realize when she's about to cum because she starts getting really fast.
EDIT:
Don't upload duplicate files on the forum, link to them instead. Plus it's loader only so you really don't want to be posting this outside of a loader board.