Y/N knew that the release of Excalibur and the death of Kokabiel at his hands would have consequences for all three biblical factions. The various statements made during the course of the battle also had consequences.
First, as Y/N had predicted, Xenovia was labelled as a heretic after she reported God's death. Since there were many candidates to challenge Excalibur, Xenovia returned the five fragments in her possession, although she had been given Durandal. Since she was naturally endowed with the Sacred Element, there were not many suitable candidates for that sword.
Obviously, at the specific request of Y/N, Xenovia kept the church in the dark about the existence of the Sword of the Promised Victory. They would surely have tried to take it from him, even though they would surely have died trying.
Also, after Kokabiel revealed that Y/N was not from that world, both Rias and Sona wanted explanations about who he really was and why he kept it a secret that he is a Pendragon. Y/N only confirmed that what Kokabiel said corresponded to the truth and stated that it was enough for them to know this because, having no way to return from where he came from, it was useless for them to know how he got there.
Since he had attracted the attention of the two heiresses, Y/N had always tried to make it clear that he had no hostile intentions. Of course, since Sona was a more intellectual person than Rias, It would not have been enough to say that he had a Sacred Gear that allowed him to create swords of all types and he did not object when the Sitri Heiress asked him to give her a little demonstration.
However, having reproduced Gram, the sword belonged to Hero Sigurd, was not Y/N's expedient to gain her trust. Since he had created out of nowhere a demonic sword that could make Kiba's swords small, then he could very easily create a sacred sword that could easily kill them without them can do anything. So, it was both a sign of his good will not to cause problems to the Gremory and Sitri families and at the same time a threat for them and Kokabiel had been the practical demonstration.
Hoping that the two heiresses would receive the message, Y/N, his sister and Tamamo had to face the Heaven faction. It was a calculated risk, but they did not expect this to occur two days after the death of the Cadre Fallen Angel.
Two of the four Great Seraphs, Michael, and Gabriel, were currently inside Y/N home. Michael was a man with long blond hair and green eyes. Unlike Kokabiel, he had six pairs of golden wings behind his back and a perpetually distressed look. Gabriel, unlike the name suggests, was a beautiful woman with a voluptuous figure. She has long golden blond hair and green eyes.
They were currently sitting on the sofa. Mordred sat in the armchair, while his younger brother Y/N had taken three chairs for him, Xenovia and Tamamo-no-Mae.
To prevent the two seraphim from causing chaos, Y/N had told Kuroka to stay in his room. For safety, he had also reinforced the bounded fields so that her demonic signature would not be perceived. He ardently hoped it would be so.
"So," Y/N began, interrupting the awkward silence that permeated the room, "I guess you're here to talk about what happened with Kokabiel two days ago?"
Michael nodded. "First all, I'd like to thank you for protecting Xenovia and Irina and preventing a new war from breaking out," the archangel said with a little bow in his head, "I imagine Rias Gremory and Sona Sitri have already told you the consequences that the Great War has brought on all three biblical factions. In addition to the death of God and the four Great Satan, many angels, devils and fallen angels also perished in the conflict."
"We cannot reproduce without falling from grace and we do not use a system that allows us to reincarnate human beings like devils do," Gabriel continued, "for this reason, a conflict now would be disastrous."

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The Holy Knight of DxD
FanfictionThe child of Emiya Shirou and his servant Saber AKA Artoria Pendragon is sent to another dimension following a certain incident. This world is inhabited by supernatural creatures such as angels, fallen angels and devils as well as humans and other c...