WE GOING BACK TO WINTER ARCS MEH CHILDREN. Also if you guys don't say if the reader is a human or gem for sure I have to assume gem.

No one's POV:
Antarcticite had been used to having no partners but when Phos and a young female gem whom Antarc hadn't met before were awake and requesting to do something. 

The moment Antarc looked into her eyes his heart skipped a beat. His cheeks did have a very very small dust off pink on them but due to him having a neutral expression it was impossible to see it.

After the three got paired up Antarc immediately noticed how Phos acted towards the young female gem. He acted more clingy and nicer to her.

[Don't worry he won't be harmed... just yet~]

Of course in return the white haired gem quickly acted meaner towards Phos. But to the young female gem it seemed more like they were brothers bonding slowly.

It was far from that though. Antarcticite wanted to obliterate Phos for even hugging the f/c gem. Antarc wanted Phos to be smashed into the same and become unfixable. Antarc didn't do it yet though because if the f/c gem saw it happen she won't wanna be around him anymore.

So he planned to keep the f/c gem in the room with everyone else for the moment while he obliterated Phos. Of course Y/n was slightly confused about why Antarc wanted her to stay but she assumed it was he was worried for her.

Y/n wasn't able to stay awake though because since the sun wasn't out as much she didn't have that much energy to stay awake and wait for the two gems to get back.

~Meanwhile~

Antarcticite and Phos were walking near the ice floes. Phos whines and falls again "Why are we even here again?" Antarc stayed silent though, this had confused the mint haired gem slightly cause Antarc usually would answer the question.

[Just roll with it~]

Antarcticite pulled his sword and slowly turned to the gem behind him. "You've been getting to close" his cold voice spoke out which slightly frightened Phos. "Um who do you mean Antarcticite?" Phos spoke in a nervous tone.

"You're getting extremely to Y/n...she's mine not yours." Antarc said while swinging his sword at Phos. Phos was barely able to dodge it and his arm got hit in the process. "W-wait! Antarcticite! T-this is a complete misunderstanding!" Phos screamed in an attempt to calm Antarcticite down.

It didn't calm Antarcticite down at all. Antarc kept swinging at the poor mint haired gem who was screaming. Eventually the screams died down and the gem was in a pile of shards now. Antarc was huffing from all the swinging and on his face was an evil grin.

He slowly grabbed all the shards and threw them to an area where the lunarians would go with an emotionless look on his face. "Finally now Y/n can be mine and mine alone!" Antarc said while laughing a little.

Antarcticite slowly waited for the lunarians to show up and let them take the remains of Phos. He was hiding while watching to make sure they had taken all of Phos remains. He smiled inside and felt satisfied after making sure they were gone.

He grabbed his sword and made his body looked cracked and hurt. His idea was to trick the others into thinking the lunarians had taken Phos and Antarcticite had tried to save him. Nobody could say it was a lie though.

The reason was nobody had witnessed what had actually happened. When Antarcticite had gotten back he told the news to Sensei and to Y/n was helping sensei out. Sensei had frozen up and Y/n collapsed to her knees crying.

To Y/n Phos was a little brother that she loved dearly but hearing that the lunarians had taken him broke her. Sensei stayed quiet and gently gave both of the gems a small head pat. "We'll tell everyone the bad news when spring time rolls around" Sensei had spoken to them.

Eventually when everyone had woken up they were told of Phos being captured. It effected everyone of course. Y/n would visit Antarcticite while he was in the tub and smiles to his liquid form. He would feel warm and happy whenever she did this for him.

Years went by and nobody had figured out the truth. Antarcticite had gotten his love while getting rid of someone he considered a rival.

They were stuck with each other for eternity now and they wouldn't let go of the other one.

Ha finally a one shot of Yandere Antarcticite was finished. I had a while to finish this but due to writer's block I couldn't finish right away. Anyways I hoped you enjoyed. Also yes Phos is forever gone in this one shot.

~Ghoulex