WARNING: This chapter contains BDSM, rape, watersports/omorashi and futa.

When Starlight came to, she noticed two things. First and foremost, she really had to pee. And second, which came as a surprise, she couldn't move. Her hooves seemed to be bound to the wall in...well, she had no idea where she was. Her front hooves were tied together above her head, and her back hooves were spread out below her. Her tail was also tied off to the side, fully exposing her nethers and preventing her from crossing her legs, or grabbing her crotch, or anything to calm her aching bladder. This sucked.

After what seemed like hours, a figure finally entered the room. As she walked forward, Starlight recognized the familiar shape of a young alicorn. It was Twilight!

"Twilight!" Starlight exclaimed in relief. "Thank goodness you're here. I have no idea how I got here, but you're here now, I owe you one. Make it quick, I have to pee so badly."

Twilight nodded at her, but there was a smirk on her face. "You're not leaving anytime soon. Not until I'm done with you, pet."

"What are you talking about? And did you just call me pet?"

Something hard made contact with Starlight's left cheek. The pain registered through her face and shot down her spine into her bladder, causing her to wince and try to twist her flanks as best she could to reduce the pressure.

"You will speak when spoken to, pet," Twilight warned. But all of a sudden, she squeaked in what seemed like excitement. "Wow, this is fun! You know, Dash is always the dominant pony when we play together. You know how she is. But she gave me some pointers for when I had fun with you."

Starlight's stomach sunk into her hooves.

Twilight paced back and forth exaggeratedly, still smirking widely as ever and giving off an intimidating aura.

Starlight swallowed and tried to light her horn, until she realized that her horn was chained to the wall, blocking any spell she tried to perform. "Twilight, this is assault, or rape, or something, right...?"

Once again, Twilight bucked Starlight in the face, except her hoof hit Starlight's right cheek this time. A drop of piss escaped Starlight's urethra as she tried to find some way to hold it. She was not going to piss herself in front of her teacher. Even if her teacher was acting really strange.

"Listen, pet," Twilight hissed. "You can make this easier for yourself if you keep your mouth shut."

"But Twilight, you've gone crazy." Starlight managed to squeak out as she pressed her labia into the wall. It helped a bit, at least to postpone her accident.

"Since you're such a glutton for punishment." Without warning, Starlight's mouth was magically opened and something was shoved into her mouth. As Twilight tightened the strap, Starlight realized it was a ball gag. She had only heard of those things until now. But for some reason, it felt amazing in her mouth. Holy crap, was she enjoying this?

"Now to deal with your other problem," Twilight temporarily broke character to fan-filly for a few seconds. "Now I know why Dash likes this so much!" she squealed as she lowered her head toward Starlight's nethers, her wings flared in arousal.

Oh, great. Starlight had told Twilight earlier how badly she had to pee, and it was getting pretty obvious how desperate she was. And now Twilight was going to force Starlight to piss herself. How long has Twilight been this crazy?

As Twilight's tongue grazed Starlight's urethra, she couldn't take it anymore. She started pissing forcefully into Twilight's mouth, and Twilight was now lapping it all up, savoring the salty flavor. No matter how badly she wanted to stop, Starlight couldn't stop. Not without her hooves to help her hold it.

After a minute or so, Starlight's stream slowed and eventually stopped, the last drop landing on Twilight's tongue with a satisfying plop.

"Thank you for your delicious meal, pet. And now I get to feed you," Twilight reared on her hind legs, revealing a pair of testicles and a long, fully hard penis. "You like? Usually I give Dash male organs, but she's not here, so I get them instead," she chuckled.

Without warning, Twilight's magic dick was inside Starlight's pussy, and was repeatedly slamming in and out. Obviously Starlight's accident had already turned Twilight on so much, that she already seemed close. But before her orgasm, she slipped her cock back out and instead quickly ripped out Starlight's gag and shoved herself in deep into Starlight's mouth.

How Starlight liked what was supposed to be so terrible, she would never know. But she eagerly swallowed Twilight's fake magic come as if it was the best thing she ever ate. After Twilight was done, she flew back out of Starlight's mouth, her wings apparently working again. She then removed her male organs, leaving in place her natural nipples. She then freed Starlight from her bonds and affectionately put a wing around her while they walked up a staircase.

"How was that?" Twilight asked softly.

Starlight was too scared and confused to speak.

"You can talk to me normally now," Twilight reassured. "It's all over." She opened a door that led them back to their hotel room. Huh. There must have been a door to a basement that Starlight never noticed.

"Well, I liked it. A lot," Starlight sheepishly admitted.

"That's great. Dash, Pinkie and I have always wanted to add another pony to our little club. But Applejack and Rarity have their own standards, and Fluttershy is...well, Fluttershy. But you seemed like you'd be OK with it, what with your relationship with fake Sunburst."

"You know?" Starlight blushed profusely and hid behind her forelock.

"Well, I guess I spy on you sometimes..." Twilight admitted, also blushing. "But it's late. You should get to bed. We have a big day ahead of us tomorrow. We're gonna go to the waterpark and then have some more fun, if you want."

"Yes, I do want," Starlight smiled before turning in to her room. After spending her life being in charge of other ponies, who knew it would be so fun for somepony else to be in charge of her?

Author's Note

And that's the first chapter. I wanted to upload with this along with the prologue, because the prologue is so boring. XD
I think this is the first Starlight omorashi on the internet, so there's that.

Let me know how you enjoyed (or didn't enjoy) this story. I want to continually improve so all feedback is welcome. Thanks for reading!