Morning lights show up in Samuel's bedroom, and Bill wakes up hearing a doorbell. He groans, remembering what was planned today.
"Oh right... I'm supposed to meet Pinetree and prove his innocence for the prank. Ugh..." With annoyance, he gets ready to find Dipper waiting at the door, and he joins him with... some discomfort regarding the incident from yesterday. He still expects the brown-haired boy to be furious and stays silent because he's concerned.

"Hey, Sam... I mean, Bill..." Dipper still feels very disgusted about the idea that his best friend is very much gone and replaced with his demon. Yet, he witnesses the behaviour of his friend right now, as Samuel's body looks very shameful of himself instead of answering like Bill would.

On the way to school, the boy takes the courage to speak up after what felt an eternity of silence, taking all his courage.

"When I... got angry at you... for your joke... I never knew... how much it would hurt you... But... I have no hard feelings..." After a few seconds, he tries a silly joke. "Hey, do you know why bicycles fall over? They're "two-tired"!" He giggles a bit, hoping that it'd be contagious, but Bill... still has a stern look to his face. So he thinks... "I need something more... his style..."

"Do you know it's stupid to break someone's heart? There's only one, but you can break hundreds of bones instead!" This... is definitely not something Dipper would laugh at, and yet... it seems to give Samuel's body... a bit of an amused smirk.

Seeing that, the boy feels encouraged and tries to continue "Did you know fishes can dance outside the water? Only once for a few seconds, though." Once again, this isn't the boy's type of humor, but he hears a small chuckle coming from Bill. And thinking about what he did yesterday, he decides to take the risk of going for broke as he gets angry

"Bill... You're... the most... awful person I've ever met in my life! The most horrific... the most hateful... the most, terrible person in the entire world! I HATE you, Bill, and I hope you disappear forever!"

Bill stops with anger, and a loud grunt sounding like annoyance is heard as he stares at Dipper, who gets concerned as Samuel's body is clenching his fists. "... UM..."

But then, after some seconds of silence...
"Um... um um... um... HAHAHAHAHAHAHAHA, HAHAHAHAHAHAHAHA! Oh, Pinetree... You really got me! I didn't think you were able to handle this twisted humor that well!"

Dipper expected this reaction, he was faking anger to see if that would've worked, and... to his surprise, he thinks... "Wow, he does find this stuff funny..."

Samuel's body breathe and smiles at him. "Thank you, I needed that!"

The boy now feels a lot better, as he managed to fix his mistake from yesterday. He feels warmth in his heart. They now walk towards the school and Bill brings up an interesting topic.

"Say, Pinetree... Your usual nickname, could you tell me where it comes from?"

"Oh, "Dipper"? Well... I suppose my friends and my sister find me "dippy", so they adopted that." He says with a smile.

Bill knows it's a lie. "You sure about that...?"

Dipper gets concerned. "Yes, why?"

"Isn't there... another reason...?" He looks at Mason's hair.

Dipper goes "Oh right, he would know..." in his mind with an annoyed feeling, but he answers. "Sorry I lied, but if you know, why do you bother asking...?"
Bill lets it slide. "Wanted some talk, I suppose." He recognizes his annoyance and adds just in case. "If that makes you feel better, Bill isn't my real name either..."

Dipper is fairly surprised at it. "Oh? What is it then?"

Bill looks away. "You can't hear it. Humans couldn't handle it."

"Uh? How come?" Dipper asks, but then he sees Samuel's face close to his with a serious stare.

"Bill is a name I picked so you skin puppets could have a way to call me by a name. My real name is too dangerous for non-demons to hear. So for your sake... Don't ask anything more!"

"Uh, alright..." The boy is confused and would really like to hear more, but he obliges.

The two boys then reach the school and prepare to go inside. "So, here goes..."

The two of them enter the classroom, in presence of the entire class and the teachers that were doubtful of Mason's innoncence.
"You can do it!", says Bill, before he enters the classroom first. Samuel's body then announces "Everyone, I brought you the one and only..." He gestures to Dipper, who enters the classroom.

Dipper takes a deep breath and starts his announcement. In spite of a couple of lies, he acts genuinely apologetic. "My dear classmates, and teachers... I owe you all an apology for my behavior this Monday... I wanna say sorry to all of you as much as it is necessary for you to believe, I am fine. I think I lost some of my senses because... I was heavily troubled... I can't believe it lead me to yell and attack my best friend, but... He forgave me. And I do hope you all find it in your heart to please forgive this shameful behavior that wasn't reflective of me..."

There are some talks around, but they all seem to talk about how he doesn't act the same and seems genuine.

The math teacher is the one to ask. "And then, what was troubling you so much that day, if that was the case?"

Dipper wants to be the most honest possible. "You see... It's tough to believe, but... I had terrible nightmares the night before... Samuel tried to calm me down, but... It was too heavy for me, and I snapped, being lead by my feelings... I did get his forgiveness, and now I hope I can get yours..."

The teacher takes time to think and says. "Okay, then. I can tell your emotions today are genuine, and you're a smart boy. I trust you to never do stuff like that again, or at least seek an adult's ear if you feel troubled about something."

"I promise!", immediately confirms Dipper.

The arts teacher bring the remaining issue. "But if you are just a boy that felt troubled for the day, I don't suppose you'd be guilty of coming back to the school and cause a paint explosion as revenge for being punished..."

"Of course not!", yells Dipper, firmly.

"Then... who could've done it?"

Dipper smirks a bit. "Oh, that... I know it's hard to believe, but this whole time... This class was being invaded by a demon!"

Bill thinks a huge "WHAT? WHAT IS HE DOING?"

"It sounds crazy, insane, and such, but there was a demon around us that whole time. The most evil and the most horrible person alive… he's the one to blame for all of this…"

Bill freaks out inside: "Is he crazy? He's doing exactly what got him in trouble in the first place!"

"He is very despicable, and he has done many evils... But don't worry, I can get rid of him. For all of us!" He suddenly stares at Samuel with a smirk, which makes Bill worried. No one really dares to interrupt this.

Bill, confused about the whole things, manages to keep the mask. "Um... Are you okay, buddy?"

The kid remains confident. "Oh, I'm fine... perfectly fine..." He gives a fairly scary stare at him. "The one who isn't fine... is the evil whose reign of terror is about to end!" Samuel backs down a bit, feeling threatened, as Dipper continues. "You're scared. Are you gonna run away? Or stay?"

Bill can't believe he actually feels really threatened, like a demon of justice was possessing Dipper and about to end his existence. He feels nervous sweat on his skull, as he manages to play innocent some more. "Come on, my bestie, stop jesting like that... You do realize the whole class is judging you, right?" This statement did not bother him one bit as he stares at him intensively and confidently. Bill gives up, as he makes Sammy shrug and say. "Alright, you got me..."

He stands up to everyone. "I have a confession, everyone... My friend was speaking in codes here, because he knows the truth... I made that prank! And I'm willing to get the punishment I deserve if it clears his name from all of this!"

The teachers are surprised about the honesty. He gets asked if he's saying the truth.

"Yes, I'm honest. I did the prank alone, and I should be the only one to face consequences!" The whole class is also surprised, with some chatter talking about how much of a great friend he is to Mason after all. It does slightly irritate Dipper, however, that he manages to fool everyone with his identity.

"In this case, then this will be an entire morning of detention Saturday... And cleaning duty in the art room to repair the mess you caused."

Samuel's body shrugs. "Okay, sounds fair!" He adds. "And maybe my friend wasn't completely speaking in metaphors... Maybe there indeed is... some kind of demon inside me!"

Everyone is taken aback and Dipper feels hopeful for a bit, but then Samuel adds... "In a way, that was a bit... devilish of me to do. This is why I'm saying this, I was just following my buddy's lead."

Dipper frowns, but still considers what happened a victory. After Samuel accepts the punishment, he goes to shake his friend's hand, proving to everyone that the fight is settled. But Bill's grasp turns just a little too tight as he whispers to the boy angrily, but also with a slight hint of respect... "... Well played, Pinetree..."

The Wednesday of school now resumes, Mason's name is cleaned and he's allowed back at school early while Samuel, stands awkwardly next to him in class. And he has to spend the recess cleaning the art room for what he did.

Mabel asks what Bill is doing now, and her brother only answers he can't go on recess, and doesn't add anything. He seems to not want to show his pride about outing him for his misfits.

Author notes: There goes a big conflict solved. Now that I think about it, it's actually the end of this kind of conflicts since it's gonna be character-driven ones from this point on.
Also, the school setting will take a huge backseat from now on too, now that I think about it.

Hope you enjoyed!