She can do it, just

Candy is immediately able to get two of her fingers into her hole most likely due to the pounding it received the night before. She then forces a third one in there, but is incapable of going further.

"Come on slut, give it some thrusts and a few twists, do I have to tell you absolutely everything"

Candy complies with her new orders and starts to pound her hole with her three already inserted fingers twisting and pushing against the tight walls of her won ass, until eventually she is able to fit a fourth digit in. This causes her ass to stretch further than it has ever previously gone and elicits a soft moan from Candy. She has already learned to gain pleasure from **** after only one night.

"Mmm, you like that don't you, now imagine how good it will feel once you fit your entire fist up there"

Alice by this point has started to masturbate furiously to the erotic scene before her. Candy then withdraws all of her fingers from her ass, eager to make her mistress proud, curls her fingers into a ball and presses at her back door. The pain of her ass being stretched yet further causes Candy to squeal in pain but never the less she keeps going **** to be a good slut for her mistress. Slowly, and with lots of **** applied to it, the fist breaches the tight hole. Upon entering her ass, with her own fist the vibrator starts buzzing again. That and how turned on she is by her violation of her own ass sets off yet another orgasm which causes her to collapse, in an exhausted heap, on the bed.

Alice then removes the toy from her slaves quivering hole, re-locks the chastity belt and sucks her slaves juices off of the toy. She then stands above her naked fuck-toy and masturbates to orgasm showering the **** in her thick, gooey cum, before being true to her word and leaving her to rest.