Zack takes a moment to take in the new sights; the pink and childish room his sister's personal space has become, and the very small and innocent little girl his sister herself has become. He looks down at her as she looks back up at him; babbling incoherently and drooling out of the lower-left corner of her lips.
Pulling back his focus just a bit, Zack takes note of his sister's near-nakedness. Seeing this resurfaces some of his earliest memories, of being a three-or-four-year-old in the bath with her. He remembers that Susan would always want to wash his hair, and insisted that their mom back off for a minute; he remembers that his sister would console him when soap got in his eyes; he remembers that the two of them would dance around shivering when they got out of the water trying to quickly warm themselves.
He hasn't seen his sister completely naked for a prolonged moment of time since then--so well over a decade--and indeed still has not done so, given the diaper she's wearing covering her private parts. He had accidentally walked in on her topless a few times over the years--even completely in the nude on exactly two occasions, the shape and curvature of her breasts being acid-stained in his mind forever, much to his disturbtion.
Fortunately, no such bothersome features were present on the topless Susan in her current state.
Decidedly more scarring to Zack than the sight of perky boobs on a sibling, was those few times he saw her lower half and got a glimpse of the little patch of fuzz, which Zack--mislead by pornography--didn't even know was present on the female body; leading him to wonder if something was wrong with his sister until he built up the will to google the matter.
Another way to say the same thing is that it was a mildly traumatic set of experiences for the pubescent young man. However, he was able to rest easy at this moment, knowing that wasn't going to be an issue with Susan anymore.
Come to think of it, Zack has never seen his sister this young before outside of old photos. He takes a step forward and gets down on the floor to Susan's level.
"...hhey there!" He says, attempting to break the ice by rubbing her head.
Susan just stares at him, silently.
'Uhhh' Zack mutters to himself, unsure about what to do or say. Up until now, he has known better than anyone how to interact with Susan and how to push her buttons; but he's at a bit of a loss right now, because she's just been regressed back to infancy and he doesn't know how much of her mind is different. Does she still know she has a brother named Zack? Does she even recognize his face, or has she completely forgotten about him because he wasn't born back when she was this age?
In other words, has every single memory she's made since 1999 been erased, or has she just forgotten about speech, reading, writing, coordination, social skills, and the fact that she's supposed to be a young adult?
He entertained the theory that perhaps his sister has merely become an infant on the outside and retains her eighteen-year-old mind on the inside, but if that were the case, she would probably be freaking out right about now--or at least be acting extremely confused. Seeing as she is doing nothing but gormlessly looking around and being virtually silent, Zack thinks that is probably not the case.
"Hm." Zack hums out loud, picking up his sister by the armpits, lifting her up a few inches, and setting her on his lap. "I wish I had a way of knowing exactly what is going on in that little head of yours." He wishes, gently resting his hands on her tiny, soft legs.
Only after completing that whole sentence does Zack remember that anything he wishes becomes true... and so with a sudden blink of an eye, a clean white envelope appears right before him on the carpet.
Fumbling with the envelope whilst trying to keep the baby girl balanced on his lap, Zack pulls out a letter. Reading it out loud, he finds out...