Another excellent installment!
I'm glad you decided to allow Sally to experience some more chaos in the final rounds of the story. As I described somewhere back in this thread, I sent Sally off to be the potential rescuer if I ever decided to do any future installments/sequel. But since that never happened, and was something you never knew about, then it made sense to you that she should stick around rather than disappearing from the story.
And I like chaos in my stories so why should she escape the chaos as things spiraled out of control rolling toward the end?
And then you wrapped things up nicely and now the characters are living nicely in your universe.
I've been trying to think how I might've done anything differently and about the only thing I could even come up with is I might've had Gretchen decide to go back to college age when that option was presented. My thinking is several times she wondered if she'd made the right decision. She seemed embarrassed to see older 'girls' and had moments of insecurity. Sally teased her and she didn't take it well. Then you have them all having their minds restored so that they could make their decision from an unaffected and no longer youthened mind. So how much of Gretchen's decision to stay Bobby's age was made _base_d on a youthened mindset? Would a mentally fully restored Gretchen still think the same way?
And then there would actually be a bit of punishment for Bobby for starting this whole mess in the first place. In the end, he doesn't get the girl! But I'm kinda mean like that for a final twist sometimes.
But I really only thought of that when I tried to think of alternate endings after seeing the story come to an end. Everything just flowed naturally all the way.
That's the only real disappointment, that the story had to end!