I used to do care work
working in a flat with 5 adults all of whom were deafblind with learning disabilties and doubly incontinent. 3 of them had faecal attraction and liked to apply H block factor sunscreen. Often one would stuff as much into their gob as possible necessitating removal with fingers or the special toothbrush kept for such occasions.
A personal favourite was a gentlemen of indolent nature who would spice up his lavatorial visits by crapping on his fingers then using it as a lube to wank with.
Yes, sometimes to completion.