The Fentons' used everyone's distraction to take Emily and you as hostages. "Turn back our son into a human and let us disappear with him, or we kill those two! We're not kidding!"
This situation added a lot on top of your already stressful day. Emily and you became a torrent of fear, rage and sadness. You felt all those feelings become a tornado of power in you both, growing and growing, until you weren't enough to contain it anymore and it washed Serra as a whole, knocking down your would-be killers.
At the same time, you felt your mind expending, becoming able to understand concept no mortal could or should. Emily and you just ascended to godhood and, judging by how they looked at you, everyone felt it.
The way you ascended together, Emily and you became some sort of twin-goddesses. You were now able to understand each others like no other could, not even other gods, and shared the same sanctuary. That said, you were still scared by your new situation, not feeling ready at all to assume that new role. You were just kids after all!
Sensing your panic growing, Gaļa and the First approached, reassuring you that you weren't expect you to assume said new mantle right away, that you should live your childhood to the fullest first, that you would still grow into adult, growing old being the only thing you will never do.
Then, Emily and you created two keys to your sanctuary. One was for your mother, of course. But the other, you wanted to give to your friend Sara. "Please Ms. Gaļa, could you give it to your daughter? Let her know she's always welcome to visit."