Obviously he knew he didn't do it. Percy had hated himself for losing Nico's sister and dedicated himself, to the best of his abilities at the time, to caring for the younger di Angelo like Bianca had asked all those years ago. And Will, Will was favored by everyone. There wasn't a mean bone in the boy's body. He couldn't possible have killed those he cherished like family. But then, there was no way he could confirm any of it. He didn't remember how he got the black eye or why he squeezed his hands into fists so hard that his fingernails made his palm bleed. He found this out from attempting to sit up, and staring at the dried blood on his hands. 

"Ugh." He groaned. The pain spread over his torso like a million knives being jabbed into his skin at once. 

Upon hearing him, a red headed middle aged woman came in and started fussing all over his wounds, leaving him utterly confused. Who were these people, and why were they obsessed with his wounds? If that wasn't enough for him, five more red heads, two brunets, and one black haired person came in after her.

"Merlin's beard! What has happened?" The woman fussing over him asked.
"I... I don't remember. In fact I don't remember anything from yesterday. I..." He faltered at the sight of his dead, gaunt cousin in the corner of the room. He shook his head at the illusion.

"Nico..." He tried to speak but his voice cut off in the middle. He felt the hot sting of tears as he reached up to his neck with his left hand. Percy tried to grab something that was supposed to be around his neck, but the bead necklace wasn't there.  He looked at Will, who appeared beside Nico, only to see him shake his head in disappointment. Percy squeezed his eyes shut, and muttered something to himself. He was relieved to find the two boys had vanished after opening his eyes once more. 

"Let me try something." The black haired person stepped forward. It was a girl, someone he barely recognized from camp. 

Camp. His mind started flooding with images of Annabeth kissing another boy, all of his friends taking a turn punching him and constantly insulting him. He saw an image of his father with pity in his eyes as he agreed with his brother to kill his own son. An image of the last conversation with Nico and Will. A silent replay of the argument, all because Percy didn't want Nico to get himself killed on the quest he'd decided to take on the moment the war ended. No one knew about the quest that Nico and Will were going to begin. No one knew that was what must have killed them, not Percy. 

"Its a curse by my mother. I'm not sure why should curse someone like this. It's irreversible. He must fall in love to get his voice back. How cliche like the Little Mermaid, but how? Mother and I both watched him die." She said calmly. Most of it must have been to herself. Her blue eyes held a knowing look, one that made him desperate to ask what she was thinking, but his voice wouldn't produce the words he was trying to say.

The raven haired girl stood up and turned to the rest of them. 

"He's got to come with us. I'm sure that whatever else my mother did to him gave him the ability to fit into Hogwarts." 

"But what's his name?" One of the brunets asked. The boy. 

"Percy Jackson." She said.