wat episode was this from?

I hate you people.

“First we install the pegasus, for the wings. And then a week later when the stitches have healed some, in goes the earth pony for stamina and strength.
 
Now open wide.”

snaps on surgical gloves  
Doctor: “Okay, Miss Sparkle, I’m just gonna take a look inside here and see if I can find what’s causing you problems. Alright…in we go. Hmmm. You appear to have some blockage. Your diet okay? Wait. What’s this? An apple. Sorry. Miss Sparkle, the digestive track is a one way street and this isn’t it. There’s something else. Keys? Missing any keys? No? Okay then. What’s this now? A scroll. Must’ve been a shitty letter. Pfffhahaha! I kid. I kid.”

She saw her first penis.

Oh exploitable.

“wrong hole”
 
“wrong hole!”
 
“wrongholewrongholewrongholewronghole”

“We couldn’t fit it all in”

Invisible strap-on mare.
 
’Cos stallions are overused.

This is why you don’t cast gender swapping spells on your friends, Twi.

Iiiiiiiiiiiiiiiiiiiiiiiiiiinnnn the butt….

Twilight: ah!…uh oh, oh no… he-he’s still cumming.

Hehehehe…poor Twilight

Is it weird that I got a boner from this?

Me: (off screen) Having fun, Twilight Sparkle?  
Twilight: Yes, more!

a good stallion would pull it out if he saw twilight’s horrified reaction

@P3FOYFN  
Probably both.

First time, or big stallion?

“It feels…so weird inside. My book never said anything about that.”

Off-camera stallion?  
Off-camera stallion.

Where will you be when your laxative kicks in?

“Oh Celestia! It didn’t seem that big before!”

Diarrhea can strike at any time.

inb4 off-screen stallion