This sounds like fantastic fun, but I have a question!

If I were to change adult!Sunshine's form into her 17-year-old self during this plot, would she then be 17-year-old Sunshine, embittered and self-medicating, or would she just be adult!Sunshine in her 17-year-old self's body?

Essentially, if this is going to change them into their former selves for a time, or just put them into their former selves' shape.