Looking at your tiny step-sister, you really want to "play" with her, but you don't want her oblivious during this time, you want her exactly aware what's going on. You point the wand at her, but still hesitate. You don't want to let her know it's you unless you know you can make her forget. Deciding, you point the wand at her nervously, wishing that she'd become aware she was shrunken, but not notice you yet.
The results are immediate, the small figure jumps up and swears in surprise, you watch in amusement as she comes to terms with her position. Deciding that's long enough, you wish she'd forget the past 10 seconds. She goes still for a moment, then the small girl repeats her previous actions. Smiling, you decide that's enough, you wish for her back to her position and again, that she'd forget. This time you let it play through, then wish that she could notice you again. Her small figure slowly looks up, noticing you before covering herself. She begins shouting something at you, but you can't hear it. You look at the tiny figure, about half the size of a barbie doll, and contemplate your next action.