yes HAHAHA Ahhh  
so,good

@RIG  
Oops, did that wrong, forgot how replys worked for a second there

@The CLaUD  
Nope, is not she.

@RIG  
I tkink she’s reminding you of Princess Bubblegum, it’s got just the right shape, and it’s just the right shade of pink.

Okay, I just googled PMS & I’m dying of laughter!

@DrNazus  
Nope

@RIG  
Pinkie Pie?

I must say this Sweetie Belle looks like someone else, but i can remember who.

Rara’s faces are golden.

Rarity’s awkward-meltdown face is great, but I’m loving Sweetie’s as she comes down the stairs.
 
Re: The Joke  
Sweetie is using PMS to refer to Project Mistletoe Spike, while Rarity thinks she means Premenstrual Syndrome. Rarity’s reaction is then based on the conflicting emotions of seeing her little sister becoming a woman, the idea that the CMC are all having their menstrual cycles and talking about them to each other, and horrible ideas about what they would need a box of arts & crafts supplies for in relation to talking about menstruation.
 
Additionally, there’s the awkwardness of explaining “the facts of life” to her sister fighting against the desire to not get involved.

Someone please crop the last few panels. I’d do it but my computer can’t do it now for some reason.
 
@Background Pony #F4EC  
Plan Mistletoe Spike (PMS) is their plan to hook Spike up with Applejack. You could have just clicked the comic series’ tag to see.

@Background Pony #F4EC  
Rarity thinks Sweetie Belle gonna talk about premenstrual syndrome with that other crusaders involving arts and crafts items.

ffs what is even the joke

Ha!

Important question: who is has more “grown”? Rarity or Sweetie belle

Maybe its because I’m innocent or I simply am unaware here but I’m not getting the pun here either. But I am loving the facial expressions

@gittonsxv  
Actually i didn’t at first because i suck with english acronyms.
 
 
@Strawberry_Mask  
Oh, i see

@RIG
 
Rarity thinks sweetie is talking about premenstrual syndrome with her friends

@RIG  
reread all the chat bubbles.  
now do it again out loud.  
ok now understand that what sweetie belle is on about is not actually that.

Seriously…can someone explain me what is the joke?

ahahaha damn it xD

(I know it’s not what I think it is…but it could be!)

Why is rarity losing her shit?