Guys I have got 15 views. Good progress. You can check out my other book which is Afterdeath (Nerd!Geno x Jock!Reaper). Let's get this done!
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Third person

Ink was busy looking around the doodle sphere. He was checking if there were any problems until he decided to go to Undertale.

As he arrived in Undertale, he was greeted by Frisk and Papyrus.

"Hey Ink!" They signed.
"HELLO OTHER BROTHER LIKE MONSTER!" Papyrus shouted.
"Do you wanna check out our new house? It is on the side of Mt. Ebott,"

This timeline had gone through the Pacifist run and all the monsters are living in peace as humans have gained to trust them. It was really an amazing timeline. Suddenly Ink felt a pang of pain in his chest as he vomited black ink. Sans had just teleported to Frisk just in time to see this horror.

"are you alright ink?"
"Yup. I'm fine. I think Error has just destroyed another universe,"
"When do you think he'll stop?"
"I have a weird feeling that Error is hiding something. Just yesterday, he looked at the time and said he had to be somewhere. But he lives in the anti-void so what would make him look at the time and then leave?"
"i think he is doing something behind your back, ink. why don't cha spy on him for a while?"
"Good point. I'll try my best. See ya guys!"
"GOODBYE INK!"
Ink teleported out of Undertale and straight into Underfell.

Ink's POV
As soon as I teleported to Underfell, there was no one in sight. This was a Pacifist run so the human would not kill anyone. This means that they're dead. I went searching and looking around for any survivors and I found none.
"Wow Error. You actually killed everyone this time!"
Usually Error always misses one or two monsters but this time everyone was dead. After walking a while, I saw a dead human body in the distance. I quickly ran to them, in a chance of healing them. As I looked at them, they did not have any blue strings left over them.
Strange....this is definitely not Error's work.
Not knowing what else I could do, I tried my best to recreate the universe as much as I could. There were slight changes in some personalities for some monsters but it was the best.

Once I finished recreating Sans, he immediately looked at me worriedly.
This isn't normal. Fell is never shy whenever I create him.
"Ink, you really need to know this," Fell looked distressed and for the first time, scared.
"What is it Fell? Acting like a scardey-cat?"
"Shut the fuck up you stupid paint. This is serious! I still remember what happened and who killed us!"
"Well who is it?"
"It was Error and another small kid, who even looks like Error. I went and made fun of him cause he brought a kid to Underfell. Then he raged at me not to insult his son........."

At that moment I was shocked.
"ERROR HAS A KID?!?!?!"
"YES! But that's not all. Error killed me and like usual I was my spirit self. I saw what they did next. Then another stupid monster bullied the kid. Then that small kid actually summoned this huge pen and sliced that monster into dust!!!! Like, how powerful is Error's child!" Fell was still amazed at the child but had a discomforting feeling of what that child did to the monster.
"Well, he is Error's child. That explains some things..."
"Sorry Ink, I go to go. Boss is calling me" Then Fell teleported away, leaving myself into my thoughts.

Is this what Error has been hiding from me this whole time? Since when was he nice to have kids?
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Error's POV
After that long day yesterday with Gradient, he has been sleeping all day. I let him off since it was his first time and using magic was something that is energy draining.

PJ was in the living room, doing his homework. After I finished cleaning the dishes, I went to help PJ.

"You need some help there?"
"Umm yes dad, I do need help!"
"What is it that you need?"
"Well, my homework is to draw out a family tree. So I wanted to ask who my mom was!"
I hesitated. How could I tell to my child that he has no mother. Even I don't know who the mother is either but I know very well that these were my kids.

"Uh. I'm not sure honey. You don't have a mother. But I have 2 brothers!"
"Wowie! I didn't know I have uncles!"
"Yeah. Their names are Geno and Fresh. Geno has a husband and they both have a child called Goth,"
"I have a cousin!! When can we meet him?" PJ's eyes lit up with stars in his eyes.
"I'll talk with Geno. I haven't talked to him for a very long time. No one knows that I have kids. It will be a big surprise for my big bro,"
"What about 'Fresh'"
"That is a 90s trash and I hate him but he is my brother,"
PJ jotted down his small family tree. Amazed about having a cousin, he ran upstairs to his room.
"Heh, kids,"

Timeskip brought to you by PJ!

As I tucked my two children into bed and kissed them goodnight, I quickly teleported to Reapertale. I knocked at the gates of hell, waiting for a reply. Suddenly out of nowhere a small child jumps on my back, causing me to stumble.
"AAH!"
"OMG IS THIS MY UNCLE?!?!"
He quickly gets off me and I took a quick look at him.

He was a small skeleton child with a white cloak and a red scarf, like Geno's, around his neck which went down to his feet.
Wow. This kid has so many resemblance of bro and Reaper.
Just then, the gates opened and RT!Papyrus was at the gate.

"WAIT, ERROR! YOU'RE THE ONES DESTROYING AUS!"
"Well duh, they're all glitches,"
"I MUST INFORM UND-"
"Report me to the castle and I will have your head. " Papyrus stayed still until someone teleported behind me and almost hit me with a scythe. Luckily I teleported out of the way.

"What are you doing here, threatening my family?" Reaper asked me with a death glare.
"Oh I came to visit a dear old friend. Is that your child?" I said smirking as I was making a fool of Reaper. Reaper noticed the change of voice and sent a death aura around him.

"Stay away from my son and husband. Why are you here?" Reaper said angrily.
"The reason why I came here is to visit your husband. No big deal."
"Reaper, what is going on?" A red scarfed skeleton came behind of Reaper. They took a quick notice of me.

"Stay away from him. He destroys aus for the fun of it."
The skeleton quickly teleported. I didn't know where he went. Suddenly I was hugged from behind. I glitched out a little since I was surprised.
"Geno! What are you doing? Get away from him!"
"Why can't I hug my own brother?"
"I sai- wait, BROTHER?!" The look in reaper's face was hilarious, so was Papyrus.

"Hey Error my bro! I haven't seen you since forever!"
"Time flies I guess," I said shrugging and giving Geno a good old warm hug. Reaper was constantly staring at me, as if I was going to kill Geno.
"Mommy! Mommy! Is this my uncle?" Goth said.
"Yes Hun,"
"COOL!"
"Pfft. 'Mommy'" I was snickering while Geno gave me a disappointed look.
"You dare tell Fresh about this, I will kill you,"
"At least my kids call me 'dad'" At that moment, I realised I said to much.
"Yeah, wait HOLY SHIT YOU HAVE KIDS?!?"
"Uhhh yes?"
"Wow. I never thought a Destroyer could have kids,"
I was literally giving cold stares.
"Oh wow. I never thought the God of Death would have kids, hmm?"
Right there Reaper was pissed and i was laughing.
"This shows us clearly I am the older brother because you are to mischievous. Same with Fresh. Why do I have to be the responsible one?"
"Cause you are?"
"Shut up"
"No. Anyways I did come here for a reason. I thought I set up a play date with your kid and mines. PJ is actually excited to have a cousin and Gradient loves meeting new people."
"Nice name for a child, and yes. Why don't we meet tomorrow at 3:00?"
"Ok. See ya bro!"
"Bye Error!" I teleported away.

Third person

"Hey Geno. Why didn't you tell me about your brother being Error and Fresh. The only two people all the gods hate?"

"Well if I told you and to the other gods they would definitely kick me out being brothers with them and I might do the same thing,"

"Wow. Clever. Anyways I am going to teach Goth summoning his scythe.  He has almost done it!"

"I am going to come and see how my two babies have grown!"

"I'm not a baby"

"You are one now,"

Soon they both walked away into the forest with their child running ahead.