@Putinforgod  
so rainbow dash is the pony made of bubblegum, not pinkie?

~~Twilight: “Remember when Pinkie Pie made us believe she was pregnant during an entire month?”  
~~Rarity: “Absolutely, I almost fainted when I saw that tummy, even if some part of me was expecting it to happen later or sooner…”  
~~Pinkie: “Sorry about that girls. I didn’t want to scare you. Good thing I got the best friends ever and you helped me when I told you all what really happened!”  
~~Rainbow Dash: “I’M STILL STUCK IN HERE, FOR CELESTIA’S SAKE!”  
~~Pinkie: “Don’t be a grumpy bumpy Dashie, do you wanna some cupcakes?”  
~~Rainbow Dash: “…Ok, I wan’t some,”  
~~Rarity: “Don’t forget darling that you promised to help me with my new maternity line (Pinkie Pie just looks gorgerous in them).  
~~Pinkie: “Oki doki loki!”

@Background Pony  
Or it will end like this

Considering Rainbow’s expression seems more annoyed than “Oh god I’m going to die”, I think this has either happened before or Rainbow knows Pinkie well enough to know she’s not gonna be digested.

Rainbow dash sighs. “Could you at least eat a few more slices so I’m not stuck in here hungry, at least?”

After the indigestion Pinkie got from this, she would always be careful when eating cake with someone.

I went ahead and tagged the full series as ‘rainbow cake’, as that’s what ponythroat named it.