The relative balance of power that had existed for eons was suddenly thrown into disarray over night. The Germanic Star-Empire had suddenly revealed itself to be a Galactic Power, while the Alfheim Dominion announced a long-term military and economic alliance with the GSE, one which was sealed with matrimony between the Alfheim Empress, and the Supreme Leader of the Germanic Star-Empire.
To everyone outside of Lunaria, Erich, and Celestia, this was considered a wild and unexpected chain of events. But Erich had been doing everything he could to charm Lunaria since he first restarted the timeline. And after years of effort, it finally paid off.
As for Celestia, as in the previous timeline, she too grew attracted to Erich as she watched her mother and him develop into a close and romantic relationship. However, unlike in that timeline, she did not have the nerve to try to steal the man away for herself.