In the Maretime Bay smoothie stand, Hitch, Izzy, Pipp, Sonic, and Knuckles were gulping down their smoothies as fast as possible.

"Go! Go! Go! Go!" Sunny and Tails cheered out in encouragement. Sunny held a timer stopwatch, and Tails had a little notebook with the scores.

"Aaannnddd…" Sunny said, keeping her eyes on the watch with excitement.

At that moment, Pipp finished her smoothie fast and slammed the glass on the counter. "Totally done!" she called out with a little hiccup. "Again!" she added with a smile.

Sunny stopped the watch and checked the time record. "7.1 seconds. It’s a new Gulpathon record, Pipp!" she announced with a smile.

"And with that..." Tails said as he twirled a pencil with a hand and wrote a point for Pipp. "... Pipp and Sonic are now on a tie 4 vs 4!" he finished, as the scores showed Pipp and Sonic on a tie, while Knuckles had 2 points, Hitch 1 and Izzy got none.

Pipp smiled at her record as she turned to the others. Sonic finished his smoothie next, took a breath, and looked over at Pipp. "Well, look at that. Someone's been practicing," he said with a smile.

"Learned from the best," Pipp replied as she winked at him, which caused Sonic to blush a little.

The next to finish was Knuckles, who slammed his glass on the counter with frustration. "Damn! I thought I finally got it!" he cried out.

Hitch finished his smoothie next and breathed after slurping the cold smoothie, while Izzy hadn't finished her smoothie yet. Izzy looked at what was left of her smoothie, not wanting to feel left out, so she smirked and looked around to verify her friends were paying attention, then tossed the smoothie content out of the cup. "Done!" she called out with a smile.

"Hey!" Posey’s voice was heard behind them.

"Hooo! I drank that whole smoothie so fast!" Izzy lied with a smile and sparkling eyes. It was the fastest I’ve ever done. Wow," she finished.

Then Posey cleared her throat and tapped Izzy on her shoulder, making the unicorn turn. Then, Posey saw Posey next to her, with an angry look and some smoothie that Izzy had accidentally tossed at her.

"Oh. Hi, Posey," Izzy greeted with a smile. "Loving the new do. Purple highlights? Funky!" she cheered to Posey, thinking the smoothie was a new dew.

Posey got even madder since her head became red with gritted teeth. "Unbelievable!" she snapped and walked away in anger.

The four ponies and Team Sonic watched her go, a little shocked by her outburst. "And here I thought that she would be a lot nicer after Bay Day..." Sonic commented with concern. "Guess I should have expected that it wasn't going to happen," he added with a bored expression.

And then, Tails looked at Pipp and counted down with his fingers. "3, 2, 1..." he said.

After counting down, Pipp gasped when she started to feel something painful. "Uh-oh! I knew it!" she said while holding her head as it started to turn light blue. "Here it comes!" she said while clutching her head.

"No! Agh, no! No, no, no, no, no!" Sonic cried out as he held his head, which turned light blue as well. His quills turned on with some electricity because of the pain.

"You've gotta be kidding me!" Knuckles yelled as well, holding his nos light blue head.

"Ah! Can’t stop it now!" Hitch said, clutching his head as it turned blue as well.

"Brain freeze!" Pipp, Sonic, Knuckles, and Hitch cried out since drinking their smoothies at a fast rate frizzed their brains.

"Ouch, ouch, ouch, ouch, ouch!" Pipp cried out while Hitch moaned in pain from his brain freeze.

"Agh, why does this always happen with cold drinks?!" Sonic complained as he groaned in pain.

Izzy was the only one who didn’t have a brain freeze since she didn’t drink all her smoothies that fast, but she didn't want to be left out, so she played along. "Oh, no! I've also got the... the freeze!" she cried out fakely, pretending to have a brain freeze. "Oh! Ooh, it burns! I mean, uh, so cold!" she said.

Zipp was flying by in the sky, and then she saw her friends sin Sunny and Tails groaning in pain from the brain freeze they were having. "Oh, no!" Zipp yelled with worry, then flew down in front of the stand, where Sunny was cleaning a smoothie cup, and Tails was preparing some more smoothies for another round. "What happened? Are they okay?" she asked with worry.

"Oh, it's just a bit of a brain freeze. It'll be over any second," Sunny smiled.

"We’re playing a contest on who gulps down their smoothie first as fast as they can, and now Pipp and Sonic are fighting for the first place!" Tails explained to Zipp.

"And Gulpathon, round twelve is up next, and there's a smoothie with your name on it, Zipp," Sunny added, holding a green smoothie for Zipp and winking at her. "What do you say?" she asked.

"Yeah... tempting, but no, thanks," Zipp politely answered as she pushed the smoothie back a bit. "I'm good. I'm working on some Pegadives. Check this one out," she said and then flew to the air and did a dive bomb towards her friends.

The others screamed and moved out of the way, with Sonic grabbing Pipp and Knuckles grabbing Izzy, but Sunny dropped the smoothies she was carrying, and they flew into the air.

They were about to hit Posey, who was smelling a flower, but then she felt like she was moved. When she turned around, she widened her eyes since she saw Sonic covered in all the smoothies that were about to hit her.

He walked to a balcony and jumped to stay on the side where he could fall into the water. "You're welcome, by the way," Sonic said in a dead tone, splashing into the water.

At the Crystal Brighthouse, Izzy, Sunny, Knuckles, and Pipp were baking something while Pipp sang the Pony Hop song with a spoon as a microphone and moved around in the kitchen.

Pony-pony, do the pony-ony-ony
Pony-pony, do the pony-ony-ony

Zipp came walking by and saw her friends in the kitchen and Pipp singing. Pipp noticed Zipp and moved closer to her, swinging her mane around.

Pick up your hooves and slide to the right
Shake your mane now side-to-side

Then Pipp held up the spoon closer to Zipp, wanting her to try it. "Come on, Zippy! You love this song!" she cheered to her sister.

"No, thanks. I'm good," Zipp answered, then she flew out of the Brighthouse.

Pipp scoffed at this outcome. Izzy held a cookie in her mouth, and Sunny and Knuckles looked on with worry.

"Well, that sure was something," Knuckles commented.

Zipp headed to the beach a little later and landed on the sand. She looked around for her friends, but nopony was there.

"That's weird. They said they'd be here," Zipp said to herself, wondering where her friends were.

And then, from out of the sand, Sunny, Hitch, Pipp, and Team Sonic busted out from under the sand, startling Zipp with their sudden appearance. "Surprise!" the group called to the pegasus.

"Hey!" Zipp called out in surprise. "What are you guys—?" she couldn't finish and screamed again when Izzy popped up behind her.

"Surpri—!" Izzy tried to cheer but got sand in her mouth and began to cough. Zipp gave a bored expression, and the others just watched with a smile. "Okay, Zipp, it's... your turn," Izzy managed to say through her coughs. And then, Zipp responded by flying back into the sky, making a pile of sand that the others got into. Izzy spitted the rest of the sand out and looked up. "Don't you wanna be a seapony?" she asked Zipp.

"No, thanks, I'm good," Zipp answered with a forgiving smile before burying them into the sand and flying off.

Then, Sonic's eyes started to twitch. "No, thanks, I'm good. No, thanks, I'm good. No thanks, I'm. So. DAMN. GOOD!!!" he yelled out in anger since Zipp kept rejecting hanging out with them.

Pipp shaved her head off the sand, spat some out of her mouth, and gave an annoying look. "Ugh! That's it! We have to do something! All she ever says is 'no'!" she pointed out to the rest.

"I get that she has a rebellious spirit, but this is going far!" Tails complained with a little frown. "Sonic got a similar spirit, but here he is with us!" he pointed out.

"Because I enjoy it even more than running," Sonic confessed with a smile. "But we gotta make her join us a little. It's starting to annoy me that she says 'no' like it was the only word in her vocabulary," he added with a frown.

"But what should we do?" Knuckles questioned as he got himself out of the sand and the rest. "It's not like we can make an invitation that says, 'Want to play with us?' and put yes as the only possible answer," he pointed out.

"Hmmm…" Pipp thought about what Knuckles had just said, and an idea popped into her head. "Aha!" she called out, planning to get Zipp to join them.

At Mane Melody, the Mane 5 sins Zipp and Team Sonic listened to Pipp’s plan to get her sister to join while they all looked at her phone.

"This is exactly what she needs…" Pipp said, then the door opened, and Zipp walked in, causing Pipp to say something that would make their plan work. "... but Zipp'd neeeeever do anything like this!" she called out, playing an act to trick Zipp.

"I'd never do what?" Zipp asked with confusion.

Pipp chuckled as the rest of their friends turned to Zipp. "Oh, hey, Zipp," Pipp greeted her and walked towards her sister. "Didn't see ya there. We were just watching a bunch of 'Yes Day' clips. Have you heard of 'em?" she asked.

"You'd hate it," Sunny added, playing along. "You have to say 'yes' to anything," she said, which caused Hitch, Pipp, and Team Sonic to laugh as Zipp looked around in confusion. "Can you imagine?" she asked them.

"Anything you want for a whole day?" Pipp added.

"It would be a pain," Tails said with a smile.

"You totally won't last even a second!" Sonic said with a smirk.

"Big L for you, princess," Knuckles mocked with a smile.

"Hey, I bet Zipp could—" Izzy tried to say. Still, she got cut off when her friends looked at her with Sunny shaking her head, Hitch waving his hoof over his neck, Pipp silencing her with a frown, Tails looking at her worried, and Sonic almost going through her soul with a glare and Knuckles holding a sign saying 'I will show them your search history'. Izzy gasped, realizing she almost screwed it, so she decided to play along. "... never do it! No way, missy! No 'Yes Days' in your future! Only 'No Days' for you for the rest of your neigh-saying life!" she cried out dramatically.

Sunny, Tails, Hitch, and Pipp looked at Izzy, confused, while Sonic and Knuckles looked at her with bored expressions. On the other hand, Zipp walked closer to Izzy, giving her a tense look, and Izzy began to sweat and gulp.

But then they felt relieved when Zipp answered. "I could do a 'Yes Day.' Easy," Zipp said with a confident smile.

This just made the rest of the crowd laugh since their plan was working, and now they had to keep going with the act.

"Good one, Zipp!" Tails mocked her as if she had just said an amazing joke.

"No way!" Hitch called out.

"You wish!" Sonic said with a chuckle.

"Not in a million moons!" Izzy finished, keeping the pressure on.

"I totally could say 'yes' for a whole day! I'll prove it!: Zipp protested to her friends.

Pipp's eyes sparkled with a wide smile, and she came closer to her sister. "Re-he-heally? Zipp Storm, are you saying 'yes' to a 'Yes Day'?" she challenged her sister, placing a hoof around Zipp's neck.

Zipp darted her eyes around uncertain before answering. "...Yes?"

Later, Pipp started doing Zipp's mane in her salon, using her special stylish tools to do Zipp’s mane.

After finishing her work, Pipp put a mirror in front of Zipp once she gave her a new look: rainbow spiky-style mane with a light bolt makeover on her face. Zipp looked surprised before smiling at her sister, loving the new look, while Pipp smiled back, and the two sisters tapped their hooves together.

But while Zipp was admiring her new look, Izzy grabbed Zipp, catching said pegasus by surprise as they made it out of the salon.

A little later, Izzy and Zipp were wearing helmets on Izzy's motorcycle. Izzy drove at a high speed, and Zipp screamed at the speed Izzy was going.

Once Izzy stopped, Zipp jumped off the motorcycle, looking dizzy from the trip and taking off her helmet with a groan.

"Whoo!" Izzy cheered, which caused Zipp to turn and see Izzy on a homemade high-diving board next to a pool filled with glitter. Izzy jumped on the board and flipped in the air. "Glitterball!" she cheered before she dived into the glitter pool, splashing glitter out in the process.

Zipp looked on and smiled in awe as she approached the high dive board. She looked down at the pool, seeing Izzy swimming around in the glittering pool.

"What do you say, Zipperoonie? The glitter's warm," Izzy told Zipp, encouraging her to join the glitter pile.

Zipp looked at Izzy for a moment before smiling. Wanting to make things more exciting, Zipp flew into the air. With a flip, she let gravity take over as she dived into the glitter pool. "Yeaaaah!" she cheered as she splashed into the pool.

Then, Sonic and Zipp race against each other, with Sonic running on the ground and Zipp flying in the air.

"What's the matter, princess?" Sonic mocked up with a smirk as he was slightly ahead of Zipp. "Are you gonna let an old man kick your pegasi flank?" he kept mocking her, which caused Zipp to snort at him with a smirk.

"I bet I'm older than you, hedgehog!" Zipp mocked back as she managed to pass him a little bit.

"I'm 35, you know," Sonic revealed with a smirk as he boosted a little to pass Zipp.

"WHAT!!" Zipp asked in shock and stopped, not expecting Sonic to be that old. Then she saw why he did this and smirked.

Sonic was close to the finish line and smiled confidently since he thought he would win, but then Zipp passed him and crossed the finish line.

"Yeah!" Zipp cheered while Sonic arrived and stopped with a smile, and the rest of their friends cheered at Zipp's victory.

"Nice race. I like a good challenge, and you certainly are one, Zipp!" Sonic congratulated Zipp as they shook his hand and her hoof.

"Thanks!" Zipp said with a smile. "By the way, is that your age, or did you just say that to win?" she questioned.

"That, I am not going to tell you... yet," Sonic replied with a smirk and a wink.

Later, again, the Mane 5 and Team Sonic were back at the smoothie stand, with Tails joining the contest as well.

"Okay, ponies. Time for the Giga Gulp!" Sunny announced while holding two big giga cups filled with smoothies, giving seven of them to her friends.

Zipp caught her giga smoothie and smiled at Sunny. Sunny nodded her head, and the others smiled at her. "Aw, yeah!" Zipp said, which caused the rest to cheer.

Then, they again started to gulp from the smoothies, and this time, Zipp was the first to finish her smoothie—with no brain freeze. "Yeah!" she cheered since she had won the first round.

"Uh-huh!" Zipp cheered as she did another thing. "Uh-huh!" she cheered again. "Aw, yeah!" Zipp called out, having the time of her life with sparkling eyes.

And then, at sunset, Zipp was forcing a smile a bit since Izzy and Tails were turning her into a seapony, while Sonic and Knuckles tried to keep themselves from laughing at how funny Zipp looked in her seapony form.

Pipp then brought her phone out in front of her friends with a smile while the others saw this and huddled together. "Say 'Yes Day'!" Pipp announced as they took their group picture together. "And... post!" Pipp said to herself as she posted the picture and turned to her sister. "Okay, Zipp. Just one last thing," she said to her sister as she dragged in her big bass speaker.

Come on, ponies
Show me what you got
I said show me what you got
Here we go now, here we go

The sound from the speaker was so loud it dissolved Zipp's sand sea tail. Zipp looked up at her sister, holding a smiling microphone, but then Pipp saw the sun setting. "There's no more time! Ugh, ponyfeathers! But you did it, Zipp! How do you feel?" she asked with a smile, wondering how Zipp felt after this whole thing.

"Honestly, I thought it was going to be the worst day ever," Zipp confessed and smiled. "But actually, I've... well... I've had so much fun! I should say 'yes' more often!" she admitted and realized how fun hanging out with her friends was.

The rest of the Mane 5 and Team Sonic cheered at Zipp with smiles, glad that Zipp would finally join them more often.

"Hand it over, sis," Zipp said, sticking out her hoof, while Pipp smiled with sparkling eyes and gave her microphone to her sister. "I really do love this song!" Zipp said with a smile and sparkling eyes as she bobbed her head to the music before singing through the microphone.

It's the pony hip hop!
Do the pony-ony-ony!

As Zipp sang, the rest were dancing to the music, once again glad that Zipp was giving them a shot to do some fun stuff with them.

THE END

Author's Note

Just to be clear: No, Sonic isn't 35 in this fanfic.

None of Team Sonic members have their canonical ages in this story, the only thing I'm respecting is that Knuckles is a year older than Sonic, but Sonic is 3 years older than Tails as well.

As for their actual ages, you'll find out eventually :)

P.S: Thanks to JD1 for editing this chapter!