As soon as Addy gets close you cause the two of them to merge into one new lovely lady going by Maddie.
-"Wowie, I'm so young and grown up now, finally I'll be able to do all those things I couldn't when I was so little and old!"
Seems like she's got a few things mixed up but that doesn't matter. You walk up to her and give her the kiss that seals her fate as your servant.