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Summary
"I'm you're favorite person?" Sirius asked through tears.
"Yes you are," Reggie nodded solemnly "and you always will be, I promise," Sirius bites his lip, he doesn't want to cry in front of the boy but it hurts, it hurts a lot, because in ten years that promise will expire, because today that promise is invalid "pinky promise," little boy sticks his finger out in front of him.
Regulus Black is a master of potions and one Thursday when he fails doesn't count. Of course not.
Regulus was working on a polyjuice based potion, he ended up a crying five year old and someone had to take care of him.
Will Regulus get something good out of this situation? Will he learn something from a little version of himself he's long forgotten?