The species change spell she used to turn her friends into breezies. :x

Magical Viagra. The missing word is “baseball.”

@McGack  
And this, of course, is the funniest part. Mad Scientist Twilight is best Twilight.

@McGack  
I never said she was good at any of them.

@Mr. Horrible  
80% of the time it backfires tho

She’s just studying new magic spells. Like she always is, all the time, since forever.
 
That’s why it always bugs me how people always complain whenever Twilight happens to know a spell that comes in handy in an immediate situation. What do you expect? She spends literally all of her spare time reading and studying and learning new magic. She’s probably knows a shit-ton of obscure, highly specific spells she’s just dying to try out.

I was gonna say erections

the Magical properties of this spell will only have lasting effects if you focus on a distant point in time for when the spell should end.

@Jarkes
 
Welcome to my world; Knowledge, I mean.
 

 
“Futa” can denote hermaphrodites too.

@Jarkes  
well look at it as another thing you can now avoid via filter

|| Futa ||

@Jarkes  
You gon learn today. Futa, in short, is a female with penis

@Trickquestion
 
And then there’s figuring out the timeline…

@Eddepicman
 
DAMMIT!
 
 
@BarryFromMars
 
And of course, my natural curiosity couldn’t help looking once I read your comment.

@Jarkes
 
Do you really want to scroll down and learn it?

@Background Pony Number 17  
That was all the way back in Season 1. This show can’t stay consistent within the same season.

@Background Pony #180F  

@Jarkes  
It’s a pretty simple concept.

@Jarkes  
Eeyep. In short, girl with a dick. You brought that upon yourself.

…I’m assuming futa is some kind of sex-related thing…
 
Yes, I’m on the internet and I don’t know what futa is. In fact, I don’t want to know, so don’t tell me. …Of course, now that I’ve said that, you’re going to tell me, aren’t you?

 
If I were to hazard a guess, I’d say she was reading up on the transformation spell she was practicing with Spike during “Feeling Pinkie Keen”. The spell required Spike to constantly focus on the objects Twilight was transforming or they’d revert back.

You are not meant to put a lot of thought into shows like this.

Twilight, now an alicorn, is jealous on how the other alicorns’ horns are longer than hers… and obligatory mention of futa.

@twistedmetalero  
Don’t put the s at the end of spoiler

exposition spell