Nezuko Kamado and Syrus Truesdale

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Syrus couldn't remember the last time Nezuko would talk, since her sudden change into a demon it felt like a night mare to him, a total nightmare for him, when he came over when the Society of Light  and the GenX Tournament was happened.

He ran to the Yellow dorm to see some students massacred and his adopted big sister was there lying in her blood.

He screamed her name and begged her to wake up and he took her to the nurses office or rather tried to take her there before she woke up snarling and nearly bit him before he and Nezuko fell into the lake where he survived as Hassleberry found him but noticed how weird Nezuko was acting before she tried to bite him as well but Syrus found a thick stick to jam her mouth and tried to stop her.

https://youtu.be/uSwB6dchy8Q

Then the next thing happened was that someone tried to kill her but he told him that she didn't kill the other students.

Then he woke up to see a bamboo tube in her mouth like a muzzle on a dog.

The entire Yellow Dorm had to be cleaned of the blood and corpses, their deaths were unknown but the island had no bears or any animal that would do it.

When he transferred to Obelisk Blue, Nezuko patted his head instead of her talking, he missed hearing her voice when she praised him.

Then the day of transfer students arrived and he was used as bait for Jaden but Nezuko came by and she was beyond pissed but she looked hungry because she was drooling from her muzzled mouth and she was struggling to not tear off the muzzle instead, she ran off somewhere and she came back before crying and hugging him.

When Jaden became the Supreme King, she fought off and killed every duel monster that tried to hurt them by any brutal way but Syrus fought back his doubt and accepted that Nezuko was just protecting them.

Even with Trueman, she fought back with her own blood and exploded it at the darkness.

Then, she spoke that one day...

"M...M.." Syrus looked and Nezuko didn't have her muzzle on and moved her lips. 

"M...M...Morning!" She said as Syrus cried and hugged her.

Brothers and a Sister, hands in hands.

Together.

An unbreakable bond.