"You promise you'll help me bake tomorrow?" Pinkie asked Eridan.
"Fine, whatever." The Pegasus said, looking at her at annoyance.
"Do you Pinkie Promise?" She asked, her gaze hardening.
"Yeah, fine. Pinkie Promise."
"Say it!"
"Say what?"
"'Cross my heart, hope to fly, stick a cupcake in my eye!' SAY IT!" Pinkie yelled. Eridan looked at her like she had sprouted a second head. In the silence, Pinkie repeated it, this time doing the signals. "Say it." She said again. Eridan sighed.
"Cross my heart, hope to fly, stick a cupcake in my eye." He mumbled, doing the movements along with the chant. Pinkie smiled.
"8 o'clock sharp! Well, night, Eridan!" She said happily, and bounced off. The Pegasus sighed and followed Rainbow Dash back to her house.
Eridan woke up in his bed and rolled onto the clouds. Staring up at the clock, he noticed it was 9 o'clock. 1 hour after he was supposed to be at Sugar Cube corner. He groaned and woke up Rainbow Dash so she could fly him down.
"Why do you need to go this early..." She asked groggily, getting the length of rope.
"I said I would help the pink one bake today. I'm an hour late." Eridan mumbled, dragging Sollux to the front.
Rainbow Dash suddenly had a look of worry and rushed up to him. "You didn't Pinkie Promise, didn't you?
"She bugged me until I did. Why?" He said, pushing the worried cyan pony away.
She chuckled nervously. "Are you sure you wanna go into Ponyville? I haven't even shown you Cloudsdale!"
"Take me to the damn town." He said. Rainbow sighed and flew down to the field outside of Ponyville.
"Good luck." She said, before flying off. Eridan ignored this and trotted into town. He eventually made it to Sugar Cube corner, and knocked on the door a few times.
"Open up, Pinkie, I'm here-"
"ERIDAAAAAAAAAAAAAAAAAAAAAAAN!" A screech erupted from behind the door. A second later, the door burst apart, causing Eridan to be sent across the street. In the doorway stood a Pink earth pony with flaming red eyes."YOU PINKIE PROMISED!" She yelled, her voice having a hint of a hellish undertone. Eridan yelped and scrambled to his hooves. He galloped through the street, Pinkie hot on his trail. He rushed into the Carousel Boutique, panting. Kanaya and Rarity stood up from working on a dress and stared at him.
"Eridan, what's wrong." Kanaya said, annoyed. Slamming came from behind the door.
"YOU PINKIE PROMISED!" Eridan stared at the two mares.
"...Oh dear." Rarity said. "Use the back door." Eridan nodded and ran out the back, causing Pinkie to start chasing him again. The two were in a game of cat-and-mouse for over half an hour, until Eridan rushed into the library, out of breath. Karkat stared at him, along with Twilight.
"The fuck. Do you need romantic advice, dude?" Karkat asked.
"What?...No, no! The pink one is trying to KILL ME!" He yelled.
"Oh, don't be silly." Twilight said. "Pinkie wouldn't try to kill anypony-" Twilight was interrupted by the door being busted open, an angry and tired Pinkie Pie standing in it's place. Eridan shrieked and tried to find somewhere to hide. "...Then again, she is front-in-line for her Pinkie Promises." Pinkie stalked into the room and cornered Eridan between a wall of bookshelves.
"ERIDAN! YOU BROKE YOUR PINKIE PROMISE!" She yelled at the scared Pegasus.
"I know, I know! WHAT DO YOU WANT ME TO DO!" He shouted, hiding under his hooves to protect himself form the Pink Earth Pony's wrath.
"I want you to APOLOGIZE!"
Eridan moved his hooves from his eyes. "....What."
"Apologize!" She yelled again.
Eridan sat up, his eyes hinting a trace of annoyance. "Fine. I'm sorry for being late to help you bake."
Pinkie Pie smiled. "Good! Now to make up for lost time."
"Again, I'm sorry." Eridan growled, hating to apologize.
“Oh that’s OK, you’re here now. What‘s a few more minutes or hours? I've been sooo excited thinking about all fun stuff we’re gonna do, I haven’t stopped bouncing since I woke up. I mean, I almost forgot to breathe! I've been so happy.”
Eridan looked at the counter of Sugar Cube Corner, then at Pinkie Pie. "...Alright."
“So, you ready to get started, Eridan? I've got everything all ready.” The pink pony said.
"...Alright." The Pegasus said again, "What are we doing-"
"MAKING CUPCAKES!" The party pony happily announced.
"Baking? I'm not good at baking, you know."
“Oh, that’s not a problem at all. I only need your help making them. I’ll be doing most of the work.”
"Okay then. When do we start." Eridan said, leaning on the counter. Pinkie Pie grinned and held a cupcake out for him.
"...I thought I was helping you bake."
“You will be. I made this one just for you before you got here." Pinkie Pie said happily. Eridan inspected the pastry, before taking it and putting it into his mouth.
"Hmm. Now what?" Eridan asked, swallowing the cupcake.
Pinkie Pie began to answer, but before she could Eridan passed out on the floor.
A few hours later, Eridan woke up to the worried face of Pinkie and a doctor.
"Eridan, Eridan! Are you okay?" Pinkie asked, shaking his shoulders. The grey Pegasus tried getting to his hooves, but was brought down with a hard sting to the side of his head.
"Oh, this is my fault. When I was making that cupcake I accidentally used some alcohol I serve at some parties! You couldn't even handle a small amount of it. I'm sorry." Pinkie Pie hoisted the hangover suffering Pegasus onto her back. thanked the doctor, and trotted outside. "I'll get you home."
"Pinkie, you know what's funny...?" Eridan said on her back.
"What?"
"I had the weirdest dream... You were takin' out all of my organs, tearin' off mah wings, saying you were going to bake them into cupcakes..." Pinkie stopped in her tracks, and laughed.
"Oh, Eridan, you're so silly. But thanks for the Nightmare night idea!" Why would anyone think that she would bake organs and Pegasus wings into cupcakes? Next thing she knows, she may be accused of wearing a dress made of cutie marks! The new ponies were so funny....