"Shhhh.... You're a poptart now~" Is the last thing you hear before being lowered into the giant toaster.
You're compressed in there. There's 8 of you but only 4 slots in the toaster. People are alternated in and out in 2 hour shifts and you can't move at all. Completely immobilized except when you're in the toaster long enough to start moistening it with your body or the rubber getting warm enough to slide around with the internal gloss becoming viscous. During this time you can edge your genitals on the slick surface of the poptart and potentially get to orgasm if you try hard enough. If you fail to orgasm in this time, or you try to orgasm again too close to the end of your shift, your tart is taken out, the pooled liquids drained, and it'll re-harden and you will be stuck on edge until it is your turn again to go back into the toaster.
Every maintenance period the poptart is washed and the insides reglossed. The gloss itself of course coats you as well and it effectively feels (when you can move around) like you're coated in filling. Is it permanent? Who knows. Depends on if I remember to let you out or not.... or if I decide to keep you there, fussy little poptart~

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Characters:
Chocochip Poptart:  Fordoxia
Smore Poptart:  sgtstitches
Cookie Dough Poptart:  CyricFionn
Strawberry Poptart:  WiProgress
One of the other 4: You
The last 3: Your friends

Simple poptart porn is not good enough for me. The common R34 artist would simply draw poptarts with faces and dicks having sex. But a furry R34 artist? No. Furries stuck in giant latex poptarts orgasming while being heated inside of a giant toaster.