Ok, quick disclaimer: I don't own, never have owned and sadly never will own the Mortal Instruments that is all owned by Cassandra Clare only the plot is mine (the first part is italics is straight from the book).

"It is done. The paths between the worlds are closed." Sebastian wasn't smiling, but he looked—incandescent. As if he were blazing. The circle of runes on the floor was shimmering with blue fire. He ran toward the platform, took the steps two at a time, and reached up to catch Clary's hands; she let him draw her down from the throne, until she stood in front of him. He was still holding her. His hands felt like bracelets of fire around her wrists. "You accept it," he said. "You accept your choice?"

"I accept it," she said, forcing herself to look at him with absolute directness. "I do."

"Then kiss me," he said. "Kiss me like you love me." Her stomach tightened. She had been expecting this, but it was like expecting a blow to the face: Nothing could prepare you. Her face searched his; in some other world, some other time, some other brother was smiling across the grass at her, eyes as green as springtime. She tried to smile. "In front of everyone? I don't think—"

"We have to show them," he said, and his face was as immovable as an angel pronouncing a sentencing. "That we are unified. Prove yourself, Clarissa."

She leaned toward him; he shivered. "Please," she said. "Put your arms around me."

She caught a flash of something in his eyes—vulnerability, surprise at being asked—before his arms came up around her. He drew her close; she laid one hand on his shoulder. Her other hand slid to her waist, where Heosphoros rested with its scabbard tucked into the belt of her gear. Her fingers curled around the back of his neck. His eyes were wide; she could see his heartbeat, pulsing in his throat.

"Now, Clary," he said, and she leaned up, touching her lips to his face. She felt him shudder against her as she whispered, her lips moving against his cheek.

"Hail, master," she said, and saw his eyes widen, just as she pulled Heosphoros free and brought it up in a bright arc,Sebastian instantly pulled out of her arms and grabbed Phaesphoros out of his scabbard, nocked Heosphoros out of her hands, brought His sword up to her throat and laughed "Now, Clarissa you didn't think I forgot to plan in case of your betrayal did you. I should hope not because that would mean you underestimated me and we can't have that now can we" He then yelled you across "you see shadowhunters not even my little sister can out smart me, now put down your weapons and surrender or die."

"Never" Jace spat across the room "you may have trapped us here but that doesn't mean we have to listen to you."

"Oh, but it does." Sebastian sneered "See if you don't listen here I can just make you drink straight form the cup-"

"Bla, bla-bla, bla, bla. Will you please shut up, all you do is talk." Said a voice from across the room "Who are you to interrupt me?" Sebastian yelled at the people standing across the room who just appeared out of nowhere.

"I, my not so good man, am William Herondale the handsomest man alive. Not so glad to make your aquatance." Claimed will.