Chapter 1:
Sonic opened the gift and found an envelope inside.
"well that was anti-climactic." Said tails.
"let's read it and judge after." Said sonic while opening the envelope and started reading the letter inside.
"My dear sonny-boy, if you are reading this that means that my fears are real and I couldn't be with you for your 20th birthday. Read this attentively, there is another message I left for you, I hid it inside a dungeon of my conception, There is map to it on the other side of the letter. It's meant to test you to be sure that you're ready to know what's in the message." Said sonic, reading.
But then he read the last part in his head:
"You must go alone, just you and no one else."
"Is that it?" asked tails.
Sonic folded the letter and put it in his pocket.
"He just wrote that… WE must go alone, with no one else except the two of us." Lied sonic.
"Oh really, That's nice." Said shadow who standing near the door.
"OH shadow! I didn't notice you!" said sonic.
"Forget it, no like I care." Said shadow before going.
"Me neither!" said knuckles who was hiding behind the same rock as before and running away.
"wait guys!" said tails.
But shadow and knuckles were already far.
"we can't really do anything about it, common let's get going." Said sonic.
"But what about the party?" said tails.
"This is my first adventure as a main character in these fanfictions!" said sonic, "I am amazed they are not called shadow boom! And besides, It wouldn't be fair to party without shadow and knuckles. I am sure Amy will understand." Said sonic.
Later:
"told you she'd understand." Said sonic putting and ice bag on his eye were Amy hit him. "Now let's see, this map. It's pretty fare."
"That's why we have to tornado." Said Tails.
"What would I do without you lil bro."
"Run, maybe." Answered tails.
In the forest:
Shadow was destroying some trees to let out his frustration.
"there are no secret agents in these trees," said sticks who just came behind him with Amy. "believe me, I checked."
"just letting out some anger." Said shadow.
"Letting out your anger is a good thing," said Amy. "That doesn't mean that it's okay for you to burn the whole forest just because you aren't part of Uncle Chuck's dungeon exploration team!"
"I Don't Care About that!" said shadow. "I just respected uncle chuck, it doesn't matter to me if he didn't talk about me in the last worlds we'll ever hear… well read from him."
"then why are you so angry?" asked Amy.
"Because he didn't talk about knuckles!" answered shadow blowing up another tree. "Uncle chuck was the closest thing he ever had to a father, Now we open up his DAMN last letter and doesn't even talk about him! That pisses me off!"
There was a moment of silence.
"He talked about another message in the letter, Didn't he?" reminded Amy.
"yeah! Maybe he talked about you guys in it!" Suggested Sticks.
"Maybe, I don't know." Said shadow, "I'll just wait and see."
"see? You overreacted a bit." Said Amy.
"didn't you just hit Sonic because he reported his birthday party?" asked sticks.
"thanks for back up sticks." Said Amy sarcastically.
"if you feel so angry, just think what poor Knuckles is feeling, maybe you should comfort him." Suggested Amy.
"… Are you serious now?" asked shadow, "Oh yeah, I am the nicest sweetest guy around! I totally should go comfort him!" he added sarcastically. "Seriously, I'll let you handle the comforting part."
And he runs off.
"I'll never get this guy." Said Amy. "Common sticks we have an echidna to cheer up."
"wait, I am coming too?" asked sticks.
"well yeah I am not gonna do this alone!" said Amy.
"but I suck at cheering up people! Remember when Percy lost her dog?" asked sticks.
Flashback:
"we really need to find him quick guys!" said percy, "or I'll get in my emotional state, you don't want to be with me when I am in my emotional state!"
"It's okay percy, I am sure he his fine." Said amy.
"Not likely, there are a lot of savage animal in the forest." Said sticks.
"Sticks…" tried amy.
"Also Eggman's robots could be lurking around." Said Sticks.
"Sticks!"
"And let's not forget the scientists who steal animals to do experiments on them."
"STICKS!" yelled amy.
"what?" asked sticks oblivious.
"I AM NEVER GONNA FIND HIM!" Said percy crying.
Back to present days:
"Yeah… but you learned from that, I am sure it will be fine! Common!" said amy.
On sonic and tails's side:
After a moment of traveling, they arrived were the map indicated.
"Great, A cave, why always a cave!" said tails.
"Look at the door, there is a symbol with the shape of a hand." Said sonic.
He put his hand on the symbol and the door opened.
"classic uncle chuck." Said sonic, "let's get in."
And They did.