Miles concentrated very hard on the pencil that was sitting right in front of him. Molly watched on, particularly worried. She had been very excited to see Miles become a sort of magical protege, a new sibling that she could confide her witchy powers in and perhaps even combine her powers with to truly gain power in this realm of reality. Molly had been so excited, in fact, that she may have overstepped her bounds and forced this part of the plan to early. Miles might not yet be magically gifted, and if he isn't, this could turn into trouble. Big trouble.
Miles concentrated for only a brief few moments.before finally giving up. The scowl on his face caused Molly to close her eyes and sigh. This was the big trouble she was talking about.
"Fuck this! You got me with your bullshit... again...." Miles trailed off. Molly's eyes shot wide open. Not only had he failed the magic portion of the change... but it seemed he had noticed the changes as well.
The change he had noticed was that Miles had a distinctly adult female voice. One that was high pitched yet powerful, one that would be perfect for shouting spells. If Miles had the magic in him.
"What's wrong with my voice? What the fuck is wrong with my voice? What the fuck did you do to me?" Miles yelled at Molly.
Whoops. Time for a change of plans.
Option 1: Molly uses small magic tricks to convince Miles that his voice is normal. She has to alter her plan to try and get Miles back on the right path to becoming her sister.
Option 2: Molly decides to screw subtlety and casts a very powerful spell in hopes of completely replacing Miles's personality with his new female goth sister personality.