A lot of Mistresses are ambivalent about scat sessions of any type. Seems like a majority won't even do it.

Of those that do, there are probably some who are willing to shit on the slave but would be reticent to then handle the stuff afterwards, even with gloves.

I'm guessing that it might be difficult to find a Mistress for this type of session.

For me, personally, I would prefer to be ordered to eat the stuff by a Mistress who stands imperiously above me, and the stuff.