It has been a few days, since Sans took in Eri inside of his house and helped her recover from the traumatic experience that Overhaul subjected her into. Eri, she never felt so happy in her life. She had been trapped with Overhaul for God knows how long it had been, and now, now because of Sans, she is finally free from him, and now has gained a positive outlook on her life. But it became more happier with what Sans has done for her. Due to signing an adopting form by some people, Eri has now been taken in as a new family member for the Gaster Family. Now being named to Eri Gaster, after Sans' surname and his father's surname, she is now the adoptive Younger Sister of Sans, and Eri looks up to Sans as the older brother. However, Sans also took it upon himself to help train her Quirk, Rewind, in order to not repeat the same thing that happened to her dad. While Eri was a little unsure about it at first, Sans tells her that they can test it on other stuff, such as Animals, bugs, or trees, just to avoid any unnecessary disappearances, since they will help Eri control better. Eri eventually agrees, and Sans began to help Eri with being able to control her powers.

When the others found out about her, they all adore her. However, while Atla does not adore her, she does treat her kindly, due to only seeing Sans as a big brother, rather than a love interest, which Atla does not seem to really mind. Bols' daughter, Logue, also gets along with Eri, and the 2 of them became friends, and it also helps that the both of them are at the same age of being six year old kids. Speaking of Bols, while Eri was a little scared of him at first, due to his appearance and the scary maid over his head, she eventually began to like him due to how kind Bols is. Cinder, the first and oldest adoptive sister, treats her in a sisterly way, with Team RWBY and JNPR simply noticing just how cute the girl is. Asia, Sheele, and Velvet have also taken a liking of Eri, due to their extremely kind personalities, just like Eri. Coco also seems to like Eri, but that could also be because of the clothing. This is the life that Eri had gotten, and it is the life that she had wanted to have, a family, looking over her, and caring for her well-being.

Sans smiled, as he finally gave a kid a second chance in life, and in all honesty...he is going to make sure that this second chance is not wasted, and will make sure that she does not regret it. And more importantly of all, he is going to make sure, that he will protect her from anything that tries to kill her.

He just hopes that it will be worth it at the end of the day

Meanwhile...

Outside, now in the city next to Ebott, Sans and Eri are at a forest of some kind, so Eri could practice her powers on it, as her powers can only affect living beings. So the trees count as being living. Now, Sans is trying to help her practice the speed of his much she rewinds a the state of a living being. Originally, she had trouble with trying to control the speed of how much she is rewinding on a target. But now, now she has some level of control over her powers, as she is slowing down the tree. Before, the target would be erased from existence when involving animals or small insects, as well as with trees. But as they continued with the training, she manage to slow it down to the point of simply turning them into their baby forms, or...turning a tree into its seed form.

Now, Eri's horn, which manage it grow to its original size again, began to glow yellow again, and than, the glow surrounds the tree, and began to shrunk it. Only...this time, it did not change into its seed form. No, instead, the tree shrunk until it became nothing more, than shrub. Looks like Sans' training is beginning to pay off for him, as Eri now has much more control over her Quirk than before.

After a little bit of practicing with a few other trees, Sans looks down at Eri with a smile present on his face, as he held her shoulder.

"Wow, Eri. You're clearly improving on your Quirk, after a few days. I'm proud of you."

Eri smiled happily at Sans, as he ruffles with her hair a little bit. Than she hugs him as tightly as she could, as she spoke out.

"Thanks, big brother!"

Sans smiled, as he looks down at Eri.

"You're welcome, Eri."

They look at each other, as Sans spoke out with a genuine smile present on his face.

"Hey, after we finish training, I'll go make a candy apple for ya. How does that sound?"

This made Eri much more happier, as she hops up with her arms rising in the air, excited, as she now takes a liking of candy apples.

"Yes please!!"

Sans smiled, as he spoke out.

"Than let's continue on with this, okay?"

Eri nodded and smiled, as she than began to practice her Quirk on another tree, and Sans smiled, as he continues to help train Eri with the use of her powers. Clearly, he is capable of making a little kid happy, even he made them a little too much happy. He just hopes this can go on for much longer, maybe even forever. Well, he is going to make sure that this is never ruined by anyone, especially even the people that had tormented him for so long. Well, no need to think about them right now, as they are now nothing compared to Sans. And besides, he has a happy adoptive sister with him.

In Union City...

Sans is now out shopping, as he goes out to get the ingredients that he needs to try and make that candy apple that he had promised to his younger adoptive sister, Eri. Clearly, these have became a favorite for her, and because of this, he decides to make them for her in order to hopefully make her much more happier than before.

Right now, he had just gotten the last ingredient, which he now is going to use in order to make the Candy Apple that he had promised to Eri.

"And that's the last one. There we go. Now I just got to buy this stuff and I am done for the day."

After getting the last ingredient for the Candy Apple that he will make, he than goes up to the Cashier, and began to buy the items. Thankfully, it took 14 dollars to by it. So it really wasn't to much for Sans to buy. He than began to walk out of the store, and began to go and enjoy the sunlight and the surrounding area, before he can decide to come back to Snowdin inside of Mount Ebott. Sans inhales a deep breath and sighs, as he looks to see the sunlight coming down on top of him, and he baths in it. Surprisingly, he is not sweating from the heat. And Sans, oddly, does not feel the heat at all. He than looks down at the ingredients inside of the bag, as he than spoke out.

"Well, it is nice to walk around, and see the surrounding area. But now...now it's time to cut to the chase and go meet up with Eri."

Sans than began to spread his wings and take flight, but than, a fireball whizzed past him and nearly hits his scarf, causing him to stop.

Sans sighed, as he turns around to see who it is that called out to Sans, and saw them...the fakers that had tormented Sans back at Union Academy once again. Bakugou, Deku, Shoto, Froppy, and Momo, they are all there, and they look like they are ready to fight Sans. Sans snarled, but kept his mouth closed, before he suddenly begins to grin, and he spoke out towards the group.

"Heh...y'know...I kinda hoped that we never had to meet with each other again...after all you fake heroes put me through. Let me guess, you want to get revenge on me for what I have done it the academy, that right?"

Shoto came forward, as he spoke out.

"No. The headmasters sent us to bring you to them. You are coming with us, now."

Sans than looks at Shoto, as he spoke out.

"And if I refuse to come?"

Froppy than takes the turn to speak out to him.

"If you refuse to come, than we will make you come by force. Ribbit."

Sans smiled, as he spoke out.

"Hate to break it to ya, but I have something that is pretty important to me, as I have a promise to keep for someone that I care about."

Sans than began to walk away, but Shoto used his Ice Powers to stop him, by making a wall of ice, in order to prevent him from walking away from the 'heroes'. Sans sighed, as he than turns around and closed his eyes. Clearly, these people are not going to stop until they get to him again, and bring them to the headmasters. He than laughs a little bit at this fact.

"Hehehehehehe. Well...it was kind of worth the shot at this."

He than opens his eyes, as they became a black-void color, which made the heroes uneasy at the sight of it.

"Guess you like doing things the hard way, huh?"

He spoke out in this eerily pleasant tone. Bakugou than stepped forward, and spoke out.

"You plan on fighting us? Tch, you are still the ducking pathetic weakling as you were before!!"

Sans than countered back.

"Do you mean the same, pathetic weakling that kicked your ass, and send the whole building of Union Academy down to the ground? The weakling who now became strong, by disregarding his innocence to become this strong?"

This made Bakugou angry, as he shouted out.

"Shut the fuck up!!!"

He than charged to try and attack Sans. But Sasn was not intimidated in the slightest, and in fact, he sees amused. He the extended his hand quickly, before Bakugoi could make contact with his face, and suspends him in midair. He than swings his arm to the left, and Bakugou went to the left. The impact of the building his back caused him immense pain, as he than went down on his knees. He than looks at Sans with rage in his eyes, as he than charges at Sans again and punches the ground to make an explosion. But when that happend...Sans was nowhere to be found...until Bakugou was kicked right in the stomach by Sans, who had suddenly reappeared next to him.

"Bakugou!"

Shoto spoke out, before looking at Sans and launched an ice ball towards him. But Sans got out of the way, before firing an Abyss Shard at him. He than made an ice wall and duck down. But the Abyss Shard simply went through it like it was nothing and shattered the wall. The ice shards went down like hail and hit Shoto from the back and the head, like the wall has turned into hail. Sans looks up, and spoke out to them.

"Really, that is the best thing that you can do? Pffff. I expected little bit than than that."

Momo than takes the turn to fight against Sans himself, by making a staff from her palm.

Sans than used his powers to make a crystal spear, and goes into single combat with Momo. Surprisingly, Sans is showing himself to be able to contain Momo when using the weapon. Only problem with Momo, though, is that Sans had trained with Undyne to use a weapon ever since it was a year ago before he had entered Union Academy. And this puts Momo in a really, really bad disadvantage. He than was able to hit her in the openings that she has made, before he slammed her down to the ground, and sends her flying towards a building at the right. She was able to stop herself with the pole, but unfortunately, she was not able to get a tight grip, as Sans suddenly raised her up into the air, and slammed her down to the ground. This injured her pretty badly, but it didn't cause any real harm to Momo. But Momo is not giving up on the fight just yet. In fact, it is still her turn. She than stood up, and launched a Net at Sans, who than jumped to get out of the way. He than made Abyss Shards and flung then at Momo, who than made a shield. As he landed on the ground, Momo than made some kunais and launched them at Sans, who than used the Abyss Shards and launched it the same way. He than flies in the air, to avoid getting hit by a bat, which she made and threw at him.

"You're planning on giving up yet?"

But Momo shouted back.

"Not until you are taken to the headmasters!"

She than made a chain, and extends it towards Sans, as she wrapped it around his waist. She yanks it, and Sans began to go down. Lucky thing for him, he has something that can deal with this thing.

He pulls out a cube made of crystal, which elongates into a wal, and than, when Sans huts the wall with his palm, spikes came out of it, ready to skewer her. Needless to say, Momo is completely caught off guard by what she had just seen Sans do, and if what he is about to do to her.

"Are you serious right now?!"

Momo shouted out, as she jumps back. Sans smiled, as he spoke out to her.

"Yes I am."

He than lifts Momo up into the air, and slammed her right into the wall of the same building she had previously slammed her into. This time, Momo became too tired to fight, due to overusing her powers. She tried to get up from the ground, but she fell down in the end.

Now it is Froppy's turn. She than hopped on to the wall, before she than extends her tongue to try and ensnare Sans. But Sans simply jumped back, as he than tried to slam her onto another building. Unfortunately, Froppy simply was able to reposition herself, and landed safely on the other building's wall, before Sans than tries to erupt spikes from the wall that she is on. But Froppy jumps, and Sans simply forced her to the ground with his Gravity Manipulation. She than extends her tongue again, in order to try and ensnare Sans. But Sans did something that no one really expected. Sans than suddenly grabbed her by the tongue, which made Froppy a little scared of what he is going to do next.

"Heh. What's the matter? Cat got you tongue?"

Sans spoke out, before yanking her tongue, and sends Froppy off of her fee, and swung Froppy right into Momo, who is about to get up, but than Froppy crashed right into her, knocking there both of them out. Sans smiled, as he turns towards the others. Sans cracked his neck, as these people have made a pretty big mistake in trying to take him on. Now he is going to make sure that they ever regret trying to do that to him in the end. Sans points at the other 2 still left standing, as he spoke out loud towards the both of them.

"Which one if you wants to face off against me next?"

Shoto went forward, as his right arm began to leak out an icy mist, before firing ice crystals at Sans. But Sans only looks amused by that, as he fired AbyssShards at the icicles, before firing a Gaster Abyss Blaster at Shoto. But Shoto used the icy mist to make a smokescreen, in order to prevent Sans from seeing where he is. When the Blaster fired, the mist dispersed, and Sans was unable to see where he is. Sans looked around and closed his eyes, while he focuses on his other power, as he spoke to himself.

"I know you are there somewhere..."

Sans focused...until he was able to sense Shoto, right behind him, ready to attack. Sans opened his eyes, and his scarves stopped Shoto before he could take the chance to strike at him. His left hand burned on fire. Sans looked behind him and smiled, ans he than spoke out to him.

"Was that supposed to work on me, Shoto, son of Endeavor?"

He than lifts him up with his gravity magic, and flings him forward. But Shoto used his fire powers of slow himself down, when he puts his hand on the ground, as he melt the pavement. Sans smiled, as he spoke out to him.

"How does it feel, to become an abuser as worse as him?"

"Shut up."

Shoto spoke out, as he attempted to launch a fireball at Sans. But Sans used his scarves to block the fireball, as he spoke out.

"To become not so different from him, no better than him, for what you have done to an innocent such as myself?"

"Shut up!"

Shoutout spoke out again, as he than launched a wave of flames at Sans, who than teleported out of the way, and spoke out.

"Too become nothing more, than his pawn, in order to become the number one hero?"

At these words, Shoto's eyes snapped open and he shouted out in a rage.

"SHUT UP!!! SHUT IT UP!!!!"

Shoto shouted out, as he activated his powers, with a look of fury present on his face, finally reaching his limit, and now, is ready to cause some pain and agony towards Sans for what he had just said to him.

Everyone is shocked at the way Shoto was feeling, as they have never seen him this enraged before when they are teammates with him.

"Shoto..."

Deku spoke out, as he sees his friend than launch himself at Sans in a rage, in an effort to defeat him. But Sans wanted this to happen. While dangerous in his rage state, he is also very predictable to Sans, as he was able to avoid and dodge many of Shoto's attacks, before he responds with a kick at the right side of his face, before launching a Gaster Abyss Blaster to Shoto. He dodged the attack, and tries to charge at Sans again, but Sans was able to keep on avoiding the attacks that Shoto was dishing out to him, until he finally had enough. He than raised Shoto in the air, and slammed him at a bunch of building, with Shoto's fire and ice powers damaging the buildings further, until he slammed him down to the ground, in which Shoto was finally knocked out cold. Sans smiled, as he spoke out.

"Who's number one now?"

He than looks at Deku in the eyes, as his left eye flares. Deku sparks