(Obnoxiously Innaproriate) 500th Thread Special!

>Day Normal and average in Equestria
>Twilight is horny
>She is practicing some sex majik
"I just need a cock... a big cock. Not too big though!"
>She giggles as she channels the spell
>A pinkish dick appears before her, floating in the air
"A little small... Maybe if I just increase my magic just a bit..."
>Twilight increases her magic coming from her horn
>The dick begins to grow
"Alright, that's good."
>She can't stop the dick from growing
"Oh no! What-"
>Her magic is too powerful, the dick is now as big as her
"Stop!
>It doesn't
>The dick keeps getting bigger and bigger
>Soon is pokes out the window, and Twilight runs out of the library as the building is torn apart from the massive phallus
>She has to get help!

( PaleNarrator: http://vocaroo.com/i/s0sm9o2lKvRw )

>This dick is too huge!
>Twilight calls for help from her friends
>Applejack uses her rope and tries to wrangle the penis, but it twitches and knocks her on her ass
>Pinkie doesn't help, just trying to throw a party for the biggest penis ever in Equestria
>Rarity nearly faints, from horror or arousal.
>Fluttershy just hides, she's too embarrassed
>Rainbow Dash sees it last
"Twilight! What did you-"
"Rainbow! You've gotta stop it!"
>Rainbow Dash looks up
"Wha- Why?"
>Twilight looks worried
"The penis- It's about to... ejaculate! Everywhere! The land will be covered and it will take years to clean up."
>Applejack also looks worried
"If it covers the appletrees- We'll have a whole wasted harvest. We can't handle that sort of thing- and neither can ponyville."
>Rainbow Dash glares at Twilight
"You made this problem- Why don't you fix it!"
>Twilight looks on the verge of tears
"I'm just slutty- I didn't want this to happen!"
>Rarity speaks up next
"Rainbow... Didn't you say you had especially... compensating Mareparts? Could you-"
>Rainbow Dash looks up, a hardened resolve on her face
"I'm not sure- But I'll have to try!"

>Rainbow Dash flies up to the tip of the penis
>The mountainous thing grumbles, it's going to go off soon
>If it spurts, all of ponyville will be covered in seed- And sticky for years and years
>She can't let that happen!
>She reaches the tip, and looks down
"Alright... Here goes nothing"
>Rainbow Dash gets down and positions herself, lining up her marehood with the very tip of the penis
>She sits down, sliding her mareparts over the super-sensitive tip
"I want you to cum inside; Rainbow Dash!"
>The penis gurgles
>And with a great roar, it cums!
>The white, sticky spray spurts with the force of a firehouse inside of the pony, she screams as she is filled up
>Her stomach distends from the amount of semen- impossibly so
>She keeps down however, spreading her legs more and more, the semen making her fit to burst
>Finally, after a few moments, the flood stops, and Rainbow Dash looks like a massive bean-bag sack
>She murmers weakly as the penis becomes flaccid and soon fades out of existence
>Rainbow Dash lies against the ground carefully, groaning as the hot semen is still inside her
>The others run up to her, smiling and laughing
>Twilight speaks first
"Wow Rainbow Dash, you sure are great at begin cummed inside!"
"Fuck off, Twilight."
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The end!