[[i assume you meant just reply under the assumption she just told me everything]]
The boy listened to the explanation, and took a second longer to come to terms with it. The world was not what he though it was. Normally, he would be cautious in accepting such a truth, but he had just experienced transformation, and his eyes were as objective as objective gets. There were no delusions there. Gavriil just stood there, transformed. And then he nodded. It was all he could do; he had to accept this reality as his own or he would get nowhere.
Suddenly he felt a wave of exhaustion. The feeling surrounding him receded back into his core and his features shrunk back to his normal size--which was still quite large. He lost all control over his legs and fell back into the bed in which he awoke. The transformation did not even last five minutes. He was close to blacking out, and could see the blue-haired girl in front of him as his eyelids shut themselves.
[[Note; he's not unconscious, just tired. Noriko could probably wake him up if she wanted]]