Had completely disappeared, with not even a wound marking where they once were, instead having a pitch black void. This was really odd as you were still opening and closing your fists, with the temperature rising each minute. You are even able to grab your missing part of your arm with your other (also missing) hand, but as you start rubbing your arm, you are hit with a sudden realization... maybe you weren't feeling your body. As the acid crept up your torso you decide to test your theory by pressing your hand into your stomach, and as you gesture with your nub of an arm to give your belly a push, you see the imprint of a hand across what you thought was the roof, revealing to you that you were feeling, and controlling, Toriel's body! As your Chest gets doused in the acid, you feel the pressure of two giant mounds grow, telling you that your time as frisk was almost over.
Once your head is finally submerged, you wake up in a bed, believing that entire thing was just a dream. But as you pull off your covers, you are met with the naked furry body of a monster, making you realize that it wasn't a dream, and you really became the motherly monster Toriel! As you get used to thing new body, you try using that fireball she hit Flowey with, and with the flick of the wrist, you unleash a blast of fire that somehow didn't harm anything in the room, surprising you. Trying to use more spells, you are met with failure, and as you try again, you feel a memory that wasn't your own appear in your head, telling you how to create ring of fire, though you are more interested on how you gained that knowledge.
As you sit down to "meditate", you find out that-