Twilight yawned in great frequencies. No wonder, it was late at night after a long day as a princess. She had to attend so many appointmens with „important" ponies of society. And as the Princess of Friendship, it was her duty to solve friendship problems all across Equestria. There could be great adventures waiting for her for which she was glad; however, she swore to herself that she would burn the next pony who called her to solve a problem, just to ask Twilight which present that pony should give her bestie.

And there were still her friends who needed her help. Just today she had to help Applejack with Applebucking because Big Mac injured his right hindleg again. Luckily this time her stubborness and pride didn't stop her to ask for a helping hoof.

On top of all of that she continued her studies on magic and friendship although she wasn't technically Celestia's student anymore but a fellow princess. That was also the reason why she was still up instead of a so much needed sleep.

She had to read a book about creatures who were imprisoned in Tartarus. Celestia thought that it would be a useful assignment after her confrontation with Tirek. Some creatures were known to the greater puplic like the cockatrice or manticore. However, there might be as much with little to no information. Evil beings as old as time itself, so only Celestia and Luna knew of them.

One of these was Asmodeus, the demon and personification of lust. Just by reading about him, Twilight's marehood got all itchy. She was in heat.

Normally it would not be problem as a princess. Luna and Celestia had many lovers and affairs to handle with that.
And even Cadance had that nice, juicy and thick cock of Shining Armor. Before their marriage he often helped Twilight out but now they reigned far away in the Crystal Empire.
Therefore Twilight was alone with her problem. Yeah, there were stallions around here, even one who was very good endowded, the one and only Big Mac. The myth was true that farmer boys had the biggest and best cocks. His cock was nearly two feet long. Just thinking about it made her almost drool.

Unfortunately she was just too shy to ask a stallion for help. Reading or thinking about fucking or even writing about it in one of her fanfictions were completely different things as actively asking somepony out.

Even if she had the courage she just would not have the time to date somepony. But all this thinking about bucking just made her even more lustful and her marehood itched unpleasant. As she looked down to it, she saw that it was already sligthly glistening.
Maybe she should ask the demon himself whose fault this was what she could do to bring an end to her suffering. But a trip to Tartarus would take at least a day. There must be another way. There must be another way described in her books. So she scans the page another time. Nothing.

Already feeling defeated, she lowered her hoof to her puffy marehood. She circled around her vagina by massaging her labia. She was spreading the lips of her vulva and watched as some of her juices flowed out and landed on her hoof. To get a taste of herself she guided her hoof to her mouth and licked it off. All this excitement led to a small moan from Twilight. Her clit was now clearly visible. She touched it and played with it. She let out more moans but never came really close to finishing.

She needed help. Maybe she had a book about demon summoning in her library. Luckily she just learned a really helpful spell. She just had to think about the topic which she was searching for and all books about it would be summoned to her. And with a zap of her horn 3 books appeared in front of her. One was a adventure novel, dismissed. The other one was about a weird kinky relationship between a pony and a demon. Who would read this weird stuff?! She just threw this shit away.

The last book was much more interesting. In Old Ponish was written: ,Quomodo daemon eliciat?'. Practical. After speed reading through the book she finally found the right spell. It was difficult to cast but with her vastly more powerful alicorn magic it should work. "Asmodaee, te advoco. Ex alto somno expergiscere! Ex longo exilio resurge!", Twilight chanted.

Suddenly the earth shaked and a big creature emerged out of the dense fog which had suddenly appeared and it was 'Naked!', Twilight thought. The tall creature had goat-like legs. Its waist was narrow but its upper chest looked firm and muscular just like its powerful arms and two heart-formed, light blue nipples were seen. It had three heads and the middle one was clearly bigger while the other ones looked like they were from a bull and a ram. Around them was a thick cyan mane which flowed like a ocean of blue flames. Its eyes glowed neon green. Additionally to that two long feathers grew out of its head. Its wrists and hands faded to a light blue while the rest of its body was purple. Another three feathers served as a tail. The picture was completed by a one foot long, flaccid bull-cock which dangled down his loins. It was a weird shape to look at. In Addition this monster emitted a strong aura that way increasing any lustful feelings. No doubt, this was Asmodeus and under these circumstances there was no other possibility for Twilight than to blush.

"Oh, hello my little Luna. How long ago was our last adventurous ni..", Asmodeus interrupted himself as he saw that this particular alicorn in front of him was clearly not Celestia nor Luna who he had not seen since her banishment to the moon. Yet it was an alicorn who he did not know. "You are clearly not Luna, so who are you? Why did you summon me? Time is precious, especially the time of one of the Seven Sins.

"W..w..well, y...you know. Maybe I need some help.", Twilight stammered, still taken back by the sight of the hung, big and attractive demon which was standing in her castle's library.

"And with what? You have to elaborate.", he said. He already knew her problem. It was hard not to notice it. A strong scent of her arousal laid upon the room and a little puddle of her juices had formed behind her. He just liked to tease.

"I...I..Ijustfeelsofrustrated.Myloinisburningand itchingallday.IcannotsleepandIamanxiousthatIwillnotfullfilltheexpectationwhicheveryonehasbecauseofmylackofsleep.Makeitgoaway!", Twilight bursted and released all her built-up sexual frustration that she gathered over the time of her estrus.

"Hahaha, it isn't that easy, my little pony. Lust is an art. It is full of passion. Our libido is the thing that keeps exerpony going. You cannot just wish it away. You have to hear to your body's cravings. Only a good bucking can help you, even Celestia knows that."
"What, have Celastia and you...?", just thinking about that made Twilight shiver. "But I am just to shy to ask a stallion out. What if he says no ant then he tells his friends, they tell it everyone, they laugh at me, I have to move to another place...", Twilight began to hyperventilate.

"Chill", Asmodeus interrupted as he petted Twilight. "That is the other thing about sex. Follow the flow. Do not force yourself to do anything and also not on anybody else. Lust should be consensual and spontaneous. Maybe I can help you?", Asmodeus asked with a seductive smirk on his face.

"But you are way too big. That monster will never fit. It is already one foot-long and gets even bigger." Although she said that, she could not deny that she was curious how it would feel inside of her.

"Oh, I will make sure that it fits." Asmodeus snapped his fingers. A magical surge flows to Twilight. After it faded, Twilight felt like nothing had changed.

"What did you do to me?", she asked. "Oh, just a little spell to make you more stretchy.", Asmodeus answered with a grin on his face.
Now his strong musk was filling the room. It reached Twilight's nostrils and her marehood began to leak more fluids which spilled on the floor. Twilight approached Asmodeus now. Though she was very lecherous, she still hesitated.

"Come, my little pony. Give in to your lust." As Asmodeus said that, his cock was twitching which made Twilight drooling. This beast slowly awoke and grew. That was the last straw. She just needed a good bucking.
„Let me help you with your growing problem", Twilight muttered. “Yeah, sure. I am the one who needs help, not the one who summoned a demon fr..", Asmodeus stopped as he felt something wet around his cockhead. It was Twilight's mouth. Although his glans was already massive, true to Asmodeus' words, she could take it with ease and without an aching jaw.

"Just shut up and enjoy it!", Twilight mumbled with his big head between her lips. She began to caress his tip with her tongue. Just circled her tongue around and forced her way into his hole at the front of his cock. "Oh, yes. Just like that!", this soft spot made Asmodeus moan and his cock began to grew even more. It was now 2 foot long and still only semi-hard.

"I know that you can take more, Twilight. With my enchantment nothing can hurt you." After playing and caring for his tip and being encouraged by Asmodeus, she forced more of his cock deeper into her mouth and finally down her throat. A bulge was finally showing and it was hard to breathe but Twilight could not stop. The taste was addictive. It was finally hard as rock and a whole 2.5 foot long.

She had not been able to imagine to take this much cock before but now she was a cocksleeve for maybe the biggest cock in all of Equestria. Just feeling one foot worth of cock being down her throat almost gave her an orgasm. But it was still not enough. She needed more of this addictive cock. The penis slided deeper and deeper down. It was quite a challenge and she had to stop at 1.5 foot as the head almost found a way inside her stomache.

She was now giving it a a lock around the whole shaft which was placed in her mouth.
„Oh, you are just so eager to suck this cock." Asmodeus said between his moans. "Yes, take it.", he told Twilight as he began to thrust into her mouth and so another couple of inches of his mighty and strong cock glided into Twilight's mouth.

That was the final bit that let his dick now being in her stomache. It was an obscene look, a little, purple unicorn with a cock in her mouth half as long as her. Hitting her limit and because it was getting hard to breath, she decided to let his cock slip out. And maybe because her whole body felt like it was on fire because she still had not been relieved of her heat.

"I need you right now, inside me" Twilight commanded Asmodeus between her short breaths and gasps.
"I am happy to oblige, my little cocksleeve." Asmodeus positioned himself behind Twilight's vagina and entered her with a powerful thrust which let his head enter her pussy. "Ah, yes. Finally!", Twilight shrieked as she hit her first orgasm because of all her excitement and just the sheer bigness of the cock which penetrated her. She squirmed all over his thickness.

"So easy, Twilight?", Asmodeus teased. But Twilight was too submerged by her lust that it nebulized all her other senses. She could only feel the pleasure and relieve she felt because of the final release from her annoying heat. Her mind and body felt like melting and now she gave way for her primal urges to take over.
"Yeah, just like that! Keep going! Fuck me hard!", shrieked Twilight, lost in pleasure. Asmodeus, the embodiment of lust and to no surprise also a fan of good sex, did not need to be told twice and now began to savage Twilight's cunt.

He trusted harder and harder. His cock slipping further and further into Twilight. Although he casted that stretchiness-spell, Twilight still felt incredibly tight. This did not even left the personification of lust cold. Between Asmodeus' heavy breaths some grunts and moans slipped in. They were even louder when Twilight's inner muscles squeezed his cock as she came. And with his endurance and experience he was able to make her cum a lot until he released his seed right into her womb. Her belly inflated because of the huge load which was unleashed as rope after rope of hot, thick cum entered her. "That was a good fuck", Asmodeus stated, as he faded away because his deed was done. "Call me next time!" And Twilight finally got her well-deserved rest with a nice, round belly.

Author's Note

So, this was my first story. Hope you liked it. If you have any critique, feel free to leave a comment.