What comic is this in ?

Rarity gets ALL the mares!  
At least Pinkie and Applejack.

@Background Pony #2A54  
Or both

@Background Pony #6348  
Either that or she at least finds them funny.

Where an unaltered picture of official material can have the “fart” tag. With Rarity no less. Comics may not be canon but Rarity is the only pony to fart on screen in official material.
 
I do kind of feel bad though that Pinkie’s favorite memory of Rarity is one that was extremely embarrassing for her. But Rarity doesn’t hold anything against Pinkie once she’s free of the Nightmare.
 
@Background Pony #0A56  
I think she just finds it funny. Of course, maybe there’s a reason we don’t often see her and Rainbow Dash alone together…

Pinkie’s got a fart fetish.

Did they just say…LOVE?!

I think it was a queef O.o!!

That’s the event Pinkie mentioned in an earlier comic.

…. nope, I’m drawing a blank here.

More fuel for the Rarijack fires.

@SaburoDaimando  
They’ve spa’d together in-show (and the earlier comic implies that scene was at the spa).

Wait. Pinkie Pie had a bath with Rarity?

HahaHAHAHAHAHAHA
 
She farted.

@Trickquestion  
but they ARE getting back via love and friendship.

I love the contrast the comics have going here.
 
On the Moon: “We can get Rarity back through love and friendship!”  
In Ponyville: “DIE MONSTER, YOU DON’T BELONG IN THIS WORLD!”

…  
RARITY FARTED IN THE TUB, CANON.

Rainbow Dash’s though bubble is NSFW.