He ate his dinner in complete silence and headed up to Mokuba's room. When he got there, the door was locked. He sighed and went to his room.

"Seto…" a voice whispered.
"Who said that?" Seto asked.
"Mheh heh heh. You're still as clueless as ever," the voice responded.
"Answer my question! Who are you?"
"I am you, dear Seto."
"What are you talking about?"

A shadow spread throughout the room and patches of purple adorned what would have been the walls. Seto felt the floor disappear beneath his feet, but he floated in place instead of falling down the endless void.

A figure formed in the distance, and floated closer to him. Only his yellow, snake-like eyes were visible. It stopped about ten feet away from him, its eyes narrowing as if to show scorn.

"I demand to know who you are!" Seto yelled.

The humanoid creature remained silent, instead wrapping itself around him.

"I need your help…" it whispered.
"What are you talking about?"
"Seto…bond with me."
"I don't get involved with shady figures such as you."
"Shady? I am a part of you, dear Seto."

Seto glared at the shadow.

"The bond needs one more thing, Seto."
"I've had enough of your games, freak!"

Seto tried to squirm out of his grip, which only grew tighter the more he struggled.

"Let the darkness into your soul once and for all…"
"Is this some kind of prank?"

When the shadow let go of him, he was surrounded by spherical puzzle pieces. As the connected themselves piece-by-piece, he could feel himself growing weaker. It wasn't long before the pieces had formed a complete sphere around him.

"I am reborn," the shadow whispered.

There was a flash of light, and a scream. Mokuba ran into Seto's room to see what had happened. What he saw was a sight to behold.

Mokuba watched in horror as his brother cried in pain. He was turning a ghastly white as his eyeballs melted from their sockets. A black shadow poured from his chest, soon covering his entire body. He fell to his knees and struggled to try and release himself from the soul chamber. Mokuba couldn't see this, as it was all in Seto's mind.

"GET OUT OF MY HEAD!" Seto yelled.
"What's happening?" Mokuba asked.

When Seto turned to look at him, his face was hideous. His nose was completely gone, instead replaced by two holes not unlike one you'd find on a skull. His mouth was filled with razor-sharp yellow teeth. Two pairs of yellow eyes looked at Mokuba somberly.

"Mokuba, you must leave! It's not safe for you here!"
"I don't want to leave you here!"
"It's for your own good!"

Seto melted into a puddle, and everything was quiet.

Mokuba approached the puddle with caution.

"Seto…?"

When he went to touch it, the puddle began to bubble. Mokuba stepped back warily as a human-shaped figure rose from the puddle. Two slits appeared where his eyes would be, which opened to reveal gold-colored eyes. His hair formed a shape similar Seto's, but it turned green instead of brown. As his skin went from purple-black to a pale peach color, he chuckled to himself.

"Mheh heh heh," the figure said.
"Who are you?" Mokuba asked.

As his mouth became more visible, his lips parted to reveal a wicked smile.

"I am your brother," said the creature as it slowly approached Mokuba.
"No…no you're not!"

He backed Mokuba into a corner, who was on the verge of crying. Still smiling, he touched Mokuba's face softly.

"Such an innocent boy," he muttered. "This much innocence should be a crime against humanity."
"…You wouldn't dare…"
"Sexually assault you? Why the hell would I do something so disgusting?"

He turned away and sighed. Feeling that he had successfully shown his superiority, he walked towards the clothing closet and picked out some clothes to wear.

"You know, I really am your brother," he said as he picked out a dusty white turtleneck shirt.
"How do I know you're not lying?"

Seto looked back at him while airing the shirt out. His nose had grown in by this time.

"This 'Seto' told you not to trust anyone, didn't he?"
"I do recall something like that."
"He taught you well."

Mokuba remained silent as Seto shuffled through the closet for some pajamas.

"I can not prove to you that I am indeed your brother," continued Seto. "But I can at least assure you that I won't lay a finger on you."

Mokuba growled at him, showing his distrust towards the imposter.

"I'm too tired to do something like that right now," Seto replied. "Let's just go to bed."

As Seto lay sleeping in his bed that night, he once again had the nightmare of being devoured alive by monsters from the card game.