Monarch Manipulation

"You heard me you worthless cunt, take that horn of yours and fuck my ass with it until we both cum, or do you not want to be my bitch?"

Twilight panicked and cried "No no, I do! I do! Please forgive me!"

Starlight smirked and said "Well, I'll consider forgiving you if you just do as I ask"

Twilight nodded and said "Yes Miss, immediately". Twilight bowed her head and with some careful aiming managed to get the tip of her horn perfectly lined up with Starlight's asshole. Twilight, having never done this before, didn't realize just how sensitive and easily stimulated a horn could be, which is why she moaned loudly as she slowly inserted her horn into Starlight's ass until her forehead was pressed right up against her ass cheeks. Starlight also let out a little sigh of contentment, the feeling of a long smooth horn being pushed into her tightest hole was something that made her body tingle. Gently, Twilight began moving her head back and forth, thrusting her horn in and out of Starlight's warm and welcoming ass.

The movement was tricky and slightly awkward, Twilight almost had to move her entire body just to build up a consistent rhythm and it made her body ache ever so slightly, but she carried on as the pleasure in her horn kept on growing. Starlight was already very on edge and the horn fucking she was receiving was bringing her closer and closer to orgasm, but Starlight was getting impatient, while she was enjoying the soft pace that Twilight had built up, she needed to orgasm sooner rather than later. "Harder" said Starlight, Twilight grit her teeth and went a little bit faster but it still wasn't good enough, Starlight was getting there but not nearly as quick as she would have liked"Come on bitch, do it harder! Pump that horn in and out of my asshole!"

Twilight scrunched up her eyes and compelled her muscles to work even harder until her forehead was clapping up against Starlight's ass cheeks, lucky for Twilight that was just what Starlight needed as she let out a throaty guttural groan and came, her pussy squirting right onto Twilight's face. It was a few seconds later that Twilight began gasping desperately before ramming her horn as far up Starlight's ass as she could before her horn glowed and began shooting a strange liquid from the tip. Starlight cooed as the warmth of it filled her rear, she loved the feeling of raw liquid magic being squirted inside her body. When Twilight's horn died down, she felt completely and utterly drained of magic and energy and slumped to the floor with her eyes crossed and her tongue hanging out, pulling her horn out of Starlight's ass in the process.

Starlight felt refreshed as the liquid magic in her butt was absorbed into her body, she partly got Twilight to do that for pleasurable reasons, but also because the liquid magic Twilight had willingly shot into her ass would increase and strengthen her own innate magical power, which would come in handy when conquering the next three princesses. As Starlight cast the permanent heat spell on Twilight she said "Come along, I think it's time we invited your pretty pink sister-in-law in the Crystal Empire to pay you a visit".

Spike was extremely confused when Starlight and Twilight returned to the castle, especially considering Twilight was dressed as a slutty schoolgirl doting on Starlight. "Twilight..." Spike said "Why do you look like that?"

Twilight ignored Spike's question and said "Spike, take a letter!" Starlight realized that Spike's knowledge of Twilight's personality shift might jeopardize her mission, but allowed him to write the letter and send it before disposing of him, after all she still knew her time travel spell and didn't need some scroll of text to make it happen.

Meanwhile, Cadance was minding her own business when she received the letter Spike had written, she unfurled the scroll and read it to herself.

"Dear Cadance,

I know you must be busy right now, but I need to see you about something very important, could you please come to Ponyville? I'll be at the castle.

Twilight"

The tone of Twilight's letter sounded very serious, Cadance caught the next train to Ponyville. Starlight was busy getting rid of Spike, she couldn't have any witnesses other than the princesses themselves, it was part of the reason they were going to be teleporting everywhere rather than walking. Spike screamed as he was pulled into a time vortex and then there was nothing but silence when it closed, Spike landed on the ground with a thud before he stood up and looked around, but all he could see was a bunch of farm and tiny settlements. However, he noticed at the top of a very tall throne there was... oh no, that was Grogar. He had been transported to a time before Equestria was even established and he had no way back!

Back in the present, Starlight gauged Twilight's reaction and found it amusing to see that Twilight didn't seem to particularly care. It was particularly good timing as well, because Cadance had clearly thought Twilight was in some sort of trouble and had gotten to Ponyville as soon as possible and had rather stupidly not brought any guards or even her husband to accompany her, Cadance walked through the castle doors and said "Twilight, I came as soon as I could, what-" Cadance stopped as she saw Twilight stood there with a big grin on her face and dressed as a schoolgirl, which wasn't exactly what she was expecting.

Another thing she wasn't expecting was for a blast of magic to hit on the side of her head as Starlight stealthily cast her spell and launched it at Cadance. The power of the blast made Cadance stumble a little before shoe stood straight up in the same trance that Twilight had been in before her. This was almost too easy. Starlight cleared her throat and said "Cadance! Hear my voice and listen!"

After the same burst of light that came with the trigger, so did the results as Cadance turned to Starlight, bowed and said "What be your command my love?" Starlight grinned, another princess in the bag, only two more to go after she had some fun with Cadance.

Starlight decided it would be best to give her the same commands that she had previously given Twilight "Cadance, here are my demands, wear an outfit that is designed to be sexually enticing and arousing as well as make-up to match, furthermore you will adopt a personality befitting of your outfit and then after some sex, you will help me and Twilight enslave the other princesses. Do not be seen, understood?"

Cadance nodded and said "Yes my love" before teleporting to some unknown location. Minutes later Cadance returned and she had gone extremely sexual with her outfit, she looked to be the very definition of a femme fatale. She was covered head to hoof in a silky blood red dress with matching lipstick, her mane and tail had been straightened to fit the soft flowing nature of the dress and to top it all of some mascara and eyeliner with dark purple eye shadow. She was gorgeous. Cadance smirked and said "I assume you approve of my look honey?" Cadance struck a seductive pose before winking at Starlight, who was already getting wet at the sight.

Starlight grinned "Excellent, very excellent indeed. I think I already know what I'd like to do with you". Starlight closed her eyes and lit up her horn, focusing the magic on herself she replaced her vagina with a long think stallion cock and a heavy set of testicles to go with it. Cadance and Twilight eyed the newly crafted male appendage with awe and just a hint of desire. "Cadance" said Starlight "Get over he so that I can mount you. Twilight, suck off her horn until it blows a magical load but don't swallow it, it belongs to me".

Cadance walked over to Starlight then turned to face away from her, using her magic to lift up the back of her dress and drape it across her back, then lowered her head so that Twilight could easy wrap her lips around her horn. Starlight was already very hard as she rear back and hooked her forelegs around Cadance's hips, with some careful prodding she found Cadance's sopping wet pussy, which was very loose but still fuckable ever since she gave birth to Flurry Heart and became a MILF. Starlight pushed forward, sliding her virgin cock into Cadance's baby maker, the sensation of having a dick and pair of balls was strange enough, but putting it to use was even weirder as she was having to get used to a myriad of new feelings in her new body parts, plus putting muscles to work that wouldn't ordinarily be in use.