Timmy managed to defeat Vicky in the Maho Mushi TV show (although barely), causing the bad future Vicky was about to make to fade away from the timeline. This was why Adult Timmy, who came from this bad future, began fading away as well.
Apparently, informing the Kid Timmy and sticking with him up until this point was enough to instill a good future upon the timeline. The victory of the final battle had been seized by the young Timmy without the need of Adult Timmy.
The future wasn't the only thing that had been healed, though. Kid Timmy had apparently developed a dislike towards adults on this very day, but thanks to Adult Timmy's interception, Timmy had realized that adults aren't always strict or mean, and that they are just a part of growing up.
Though, due to the older Timmy's interference, several memories and events he experienced lingered in the new timeline and would instill into a few others' minds as mere ideas or realizations...
However, the younger Timmy wouldn't know any of this, for he was from the past and had just made this future possible.
Instead, he tried to get Cosmo and Wanda back (as he had made himself 18 years old temporarily, the age of adulthood), and had succeeded into doing so.
Feeling homesick, he eventually decided to go out of the TV, where he was being greeted by his parents, overjoyed to see him back after they read his note. Apparently, they were upset about Timmy leaving 'forevur', so they went all over town to look for him.
They also had discovered what Vicky was really like, due to a message from an unknown stranger who referred to herself as 'Deep Toot' (Timmy had a hunch who that really was), and had acted upon this by firing Vicky as Timmy's babysitter.
However, Timmy decided to wish this didn't happen, because it meant Timmy wouldn't be miserable anymore and had to give up his fairy godparents, which was too soon for the brown-haired boy in pink. Timmy wanted to have a few more adventures with Cosmo and Wanda.
Because of this, Timmy had experienced a lot of things, such as reverting a businessman back to his clownlike roots, three adventures with an intelligent kid from a bulgier dimension, the birth of Cosmo and Wanda's child Poof, battling and reforming a being of total darkness from a prophecy (which he was allowed to experience with his buddies AJ and Chester, as well has his crush Trixie), shenanigans against the Anti-Poof, and sharing his fairies for a while with a just transferred kid named Chloe.
Several years later, Timmy had grown into a somewhat lanky 16-year old teenage boy at Dimmsdale High. He now wore a red jacket and a white shirt, but hadn't gotten rid of his pink hat.
Many things had changed. Foremost, he and Tootie are now good friends, considering each other as siblings of sorts. While that would mean Vicky would also be his honorary sister, she moved away in favor of living in dorms for college, meaning that Tootie's life had gone better. Tootie had realized that Timmy doesn't like Tootie the same way she used to, and got over her crush.
Timmy is also good friends with Chloe now. At first, they didn't seem to get along very well when it turned out they had to share fairies. Timmy didn't understand why Chloe needed them in the first place. After it turned out that Chloe was responsible for a giant mistake that left her with grief for a lost friend, Timmy understood a little more and apologized.
Chloe had a distant relationship with AJ, who transferred to college early due to his massive intelligence.
Thanks to AJ, Chester had been cured of his hives problem, meaning he can date girls without physical problems. Though, he was still a bit unsure, questioning if he's into girls at all, or if he's ace. He did become a sports ace, though.
Timmy himself had also improved. He took it upon himself to study a little more often, slowly getting better grades. What also helped was that he and his friends no longer got lessons from Crocker, who was obsessed with grading Fs to his students.
He had still gotten in many confrontations with Crocker, though, since Crocker was (still) also obsessed with fairies.
Trixie had also changed. She was still popular, but was more open about her more non-girly hobbies as of the seventh grade, gaining the reputation of a 'cool nerd'. She also became nicer to non-populars, and her friends Tad, Chad and Veronica followed suit, slowly bridging a gap between popularity and unpopularity.
Trixie had become friends with Timmy when it was known they shared their taste for comic books and video games.
Despite their chemistry being raised, Timmy and Trixie haven't been in a relationship yet. While he hasn't given up on her yet, Timmy assumed Trixie considered Timmy merely a friend.
Until one day after school.
"Hey, um, Timmy", Trixie said. "Do you want to hang out with me in the park?"
"Oh, um, sure", Timmy responded. "I've got nothing else to do."
Timmy and Trixie were sitting on a park bench, relaxing in the warm spring sun while watching several kids playing with a ball. Both had already texted their respective parents they would arrive home a bit later
After a while, Trixie said: "Timmy? I, um, want to tell you something."
Timmy glanced towards Trixie with slight surprise. "Alright, shoot", Timmy replied.
Trixie fumbled with her fingers. She didn't know where to begin. She exhaled, and said: "Timmy, for the longest time, I had this... weird dream."
"A weird dream", Timmy asked.
"Yeah", Trixie confirmed. "You, I and some friends of you were on some kind of blue moon, and there was this black void that was sucking up almost everything. All of us were about to be sucked in, but then you believed the void only wanted you, so you sacrificed yourself. The two of us were holding, and kissing each other before you let yourself suck in. It sounds weird, but I've got a feeling I actually did experience it before."
Timmy recognized the event in Trixie's dream. It was when the Darkness was relentlessly searching Timmy while destroying everything in its path. It was a little formidable Trixie could remember a bit of those events, albeit subconsciously, since her memories about it should've been erased. Not because Timmy wanted them to be erased, but because she and Timmy's friends got to know about the existence of fairies.
"It was a weird dream, but it made me realize that you're actually pretty important to me", Trixie continued, "and that I had taken you for granted. And then I realized how shallow and mean I had become. I wanted to change that."
"So you became more truthful about yourself to us because of that dream", Timmy asked.
"Y-yeah", Trixie said. "I know it sounds really silly, but I'm glad it has turned out like where I am now, even if the events in that dream actually did not happen."
"Me too", Timmy said.
"I bet you do", Trixie said.
The two were silent again, as a breeze blew in the grass.
"Timmy?", Trixie asked, breaking the silence.
"Yeah?"
"I want to tell you something else, too."
Timmy looked at Trixie in the eyes with curiosity. "What is it", he asked.
"W-well", Trixie said, fumbling with her fingers again, "I, um... remember when we became actual friends?"
"Of course I do", Timmy said. "You confessed that you liked comic books, and I told you I was Timantha. What about it?"
"Well, um..." Trixie looked a bit downwards while blushing immensely. "S-since then, my feelings have grown little by little, and, umm..."
She looked at Timmy straight in the eyes, her face still as red as a beet. "Timmy", she asked, "do you still... love me?"
Timmy was flabbergasted. That's quite a surprising question coming from Trixie. Does she...?
"As in, love you love you?" Timmy asked. "The 'I-want-to-hold-you-tight-and-kiss-you-on-the-lips' love you?"
Trixie nodded.
"Oh, wow", Timmy said, now blushing too. "I-I never expected you to ask me this. I kinda figured you only saw me as a friend, and-"
"Do you love me or not?" Trixie asked, demanding an answer.
Timmy breathed in and out to calm down.
"I do."
Trixie's face blushed even more. He still loved her!
"But wait", Timmy said. "Does that mean...?"
"Yes, Timmy", Trixie said. "I love you too. And I want to be your girlfriend."
She inched closer to Timmy. "Do you want to be my boyfriend?"
Timmy answered by embracing her and kissing her on the lips.
When the kiss broke, Trixie asked: "I assume that's a yes?"
"You know it", Timmy grinned.
Trixie embraced and kissed Timmy back. Timmy then gave in.
Timmy cannot believe it: he and Trixie are actually going to date. He was in love with her, and she loved him back! It was like a dream come true.
Timmy had never been happier than this before. It was like he no longer needed his...
...what was it again? It had completely slipped his mind by this point.
Probably wasn't that important, after all.
Timmy and Trixie continued smooching and cuddling, as three figures in pink, green and purple flew away.
Later, Chloe met up with Cosmo, Wanda and Poof.
"Hey guys", she said. "I thought you'd be alongside Timmy today."
"Oh, well, that is no longer possible", Wanda responded.
Chloe raised an eyebrow. "Really", she asked. "How so? Did Timmy reveal his fairies by accident?"
"No way, it's allllllllll thanks to maturity", Cosmo said. "Something which I may not have!"
"Actually, it's because Timmy finally got enough happiness to no longer need fairies", Wanda said. "Also, you shouldn't worry about losing us. Da Rules have been changed so a kid sharing fairies get the fairies for himself when the other loses them."
"Oh, that's nice", Chloe asked. "Still, I wonder what made Timmy so happy in the first place."
At this point, her phone buzzed. Apparently, she's been notified by her Fwitter about a new fweet being posted. When Chloe checked it out, she was pleasantly surprised to see a selfie of Timmy and Trixie with the tagline: "Guess who just scored a great girlfriend?" The post had been refweeted by Trixie, saying: "It's true, we're officially dating!"
Since then, Timmy and Trixie were quite an item for the rest of the school year. Sure, bad things had happened between the two at some points, but they always made up in the end. It was almost like true love, with unavoidable arguments sprinkled in.
After they graduated, Timmy and Trixie were engaged, and were going to marry when the two would be 19 years old.
Before Timmy's proposal, Chloe lost her fairy godparents at the age of 18, and moved away to attend AJ's college. Of course, she and AJ were invited to attend at Timmy and Trixie's wedding, and so were Tootie, Chester, Veronica, Tad and Chad.
They were not the only familiar faces to attend at their wedding, of course. However, a few forgotten faces had attended there too, invisible to the human eye.
Three short figures in the colors green, pink and purple.
Author's Note: Aww, ain't that sweet?
Anyway, there's one more chapter to go, the epilogue. It's going to be a short chapter, and is comparable to the final scene of Channel Chasers... as in that both are a quick peek 20 years after Fairly OddParents, in the good future, that is. It is not going to be based entirely on the final scene, though, so don't expect lunchbox time capsules or evil babysitter bots to appear.
See you at the final stop!