For some reason, feeding Benben apple pie until she either gets fat or looks fit to burst is a meme.

It's specifically Benben, specifically apple pie. No idea why.

There are some explanations about that meme, the most valid until now was given by Tapper and monhan in post #1956351, about a Retaisai collaboration book titled: "I want to let Benben-chan eat Apple Pie till she's stuffed"

Lannihan said:

There are some explanations about that meme, the most valid until now was given by Tapper and monhan in post #1956351, about a Retaisai collaboration book titled: "I want to let Benben-chan eat Apple Pie till she's stuffed"

Last I checked, that was the only reason. Artist really took to the idea.
Some of the pics make Yatsuhashi look like she's envious of her sister's popularity, so she stuffs her with pie.
...which, in and of itself, sounds like one hell of a funny and slightly creepy concept, lol.

Just so you know, people can die for swallowing a needle.

Poor Benben.

Everytime I see her now, I can't help but to see her as some apple pie chompin' glutton.

Poor Shinmyoumaru. Wrong place at the wrong time.

Poor Benben, victim of new fandom memes... and likely recipient of a needle to the side of her belly.

Should i even feel bad for Shinmy