I haven't read the manga, only seen the anime, so after the last episode of the anime I don't really know where the manga goes so this is going to go in a different direction (once I reach that point that is). And this is just a prologue, the actual chapter should be longer than this.
"So you've been watching them too," Angel said, walking up to her older brother. The two of them were standing on top of a building in True Cross Academy, watching two students walking back to the dorm they shared together. They were brothers; Rin and Yukio Okumura. Angel stopped and stood next to her brother, looking up at him. He wore red jeans and black boots, with nothing but an unzipped black sweatshirt for a top. His dark red hair hid the long scar on his face that just barely missed his red eyes. A long chain hung from his neck, with a large black pendant dangling on his chest.
"Of course I've been watching them," Dragon replied irritably. He looked down at her and rolled his eyes. "For goodness' sake, Angel, what are you wearing?" She looked down at her outfit. White heels, white jeans, a black belt with gold studs, a black katana at her hip, a black cami, and a white leather jacket – also with gold studs. Her blonde hair fell to her shoulder blades, and she wore an eyepatch over her right eye. The other eye was gold.
"What?" she asked. "Too bright for you?"
"The eyes and hair are bright enough," he retorted. "No need to add to it." She was silent for a minute, observing the two boys below.
"…Dragon," she said quietly.
"Hm?"
"What do you think?"
"I already told you," he said. "Too damn bright."
"About them, idiot," she sighed. "Rin and Yukio Okumura."
It was his turn to be silent as he studied them before replying, "I don't like them."
"They're our nephews," she said softly.
"They're wrong," he growled. "Satan needs to learn to stay in his own place. Assiah is mine. Amahara is yours. Gehenna is his."
"It's a cycle," she said. "What happens in Assiah impacts the Garden. My decisions in Amahara impact Gehenna. It's only natural that Gehenna should impact Assiah and close the circle."
"Not this much," he said. "Once a human dies and is sent to the Gate of Amahara, there is no going back to Assiah. If you decide they're not worthy of the Garden and send them to the gates of Gehenna, there is no getting back to Amahara. Our half human nephews here… they're not an impact. They're a combination. Assiah and Gehenna should remain separate."
"Give the boys a chance, Dragon," Angel said. "They can't help how they were born. We'll just have to wait and see."
Dragon gritted his teeth, "I hate waiting."