Shysage found himself, still a 'people', in 'Equestria past', in the exact same stance he was in, facing the Portal while holding the frame of the Portal.
He quickly thanked true friend... ...but he was still an inch away from crying... Then he turned around.
Cel (Princess Celestia) and Lu (Princess Luna) were there, along with a bunch of other Unicorns. It looked like Shysage was interrupting some sort of magic lesson.
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Shysage began weeping softly, immediately...
"Girls, I shouldn't even be here... But the Portal is broke, and I need it badly... I really shouldn't even talk, and you need to forget I came here...
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Cel said quickly "Dad, we will help you..."
Lu burst into tears, ran over, fell at Shysage's feet, and just sobbed...
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Shysage tried to explain "Someone has cast a spell on the Portal so it causes everyone who comes through it to forget everything important to them... But I nee--"
Shysage was choking back tears, and had to stop here.
Cel said again "Dad, we will take care of that."
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Lu was still sobbing at Shysage's feet...
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Shysage knew Lu was hurting... Shysage knew that Lu was a lot more sensitive that Cel, and that the transition away from he and Summer had probably been devastating to Lu...
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But Shysage also knew that if he wasn't careful, he could change the past enough to modify the future...
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And Equestria Girls Summer needed to be waiting for him...
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And Shysage desparately wanted his Mare back too...
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And all Equestria was reeling from some unknown take-over...
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Shysage couldn't do nothing...
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Shysage sat down on the raised platform that the Portal was on...
He pulled Lu to himself... Lu's head was quickly up against his chest...
Shysage hugged his little girl tightly and sobbed with her...
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For a long time, Lu cried in her daddy's loving arms... Shysage held her... Shysage loved her... Shysage just cried with her...
Lu needed this... It was clear to Shysage she hurt so much...
And, for Shysage, everything else really did melt away... Daddy's little girl was hurting, so Shysage was taking care of her... Nothing else mattered right now... He just hugged her and cried with her... However long it would take...
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...for over two hours...
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Early on during those two hours, Shysage faintly perceived that Cel and the Unicorns used their magic to probe the Portal. A very thin, Red beam came from each of their horns.
After maybe fifteen minutes, Shysage suspected that they 'fixed' it. and a brighter, White beam came from each of their horns, all to that same spot Shysage had held to get here.
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Then the room was empty, as Shysage just cried with Lu...
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After maybe an hour and a half, Lu stood up and threw both legs around Shysage's neck, and sobbed some more. Shysage just hugged her tight, and kept crying with her.
Lu's crying slowed, then she said "Daddy, I miss you and mom so much... Thanks for visiting me though, this really helped."
After Lu said this, Shysage said softly "Lu, I love you so much...", then Shysage was sobbing for a while. Lu just cried with him.
Shysage really loved his little girl... Both of them...
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After maybe ten more minutes, Lu lay down on the raised platform, and put her head back in Shysage's lap, and Shysage slowly stroked Lu's head.
"Lu, mom and I will always love you, please remember that" Shysage said softly, trying not to cry himself.
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It was quiet, and Cel came back.
It was clear Cel had been crying too. Shysage guessed she was probably concerned about her sister.
Still, Cel's head was quickly in Shysage's lap next to her sister's, and they all wept softly for a little while, as Shysage hugged them both.
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After ten more minutes, Cel said "You should probably go dad, but thanks for helping Lu."
Shysage kissed both girls gently on their forehead, then they all got up.
Cel held a piece of paper out to Shysage with her magic, then said "Here dad, take this. This is the details of the three spells that were cast on the Portal, and are probably the same spells used, uhm, 'otherwise'. Anypony familiar with magic will understand them, and casting them backwards clears the effects.
"And dad, the last spell is disgusting. Please don't tell me what is going on though.
"And one more thing. The Portal will no longer be affected by these spells. And we have modified the Portal so that anyone who goes through the Portal will be immune to those spells from then on too. So using the Portal prevents these spells from taking effect any more."
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Shysage took the paper, folded it up, and put it in his pocket.
Then he hugged both Cel and Lu again, then climbed up next to the Portal.
"Mom and I will always love you both. Please remember that" Shysage said softly.
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Then Shysage squeezed the frame of the Portal, there was a bright flash, and he was gone...