It worked

You are a litle surprise as Benedicte kneels at your feet and says.
"I'm your's, master, eternally."

It could be the proof that the formula worked, but she still may act as to play with you.

"Did you say that I'm your master?"

"Yes, master."

"And what will you do?"

"I'll do everything you ask me to do, master."

Her voice is on a montonous tone, as she doesn't have emotions anymore, as she was a sort-of brainless robot.

"So, Can you give your panties to your master?"

You know that she wouldn't give you that if she isn't under the spell.

"Yes , master."

It seems that's in a good way.

She gets up, grabs her panties under her skirt and slides them to her feet.
She steps out of them and she folds them before giving to me like a present.

"You're a good girl."

"Thank you, master."

Now, that you have proof that the formula works, you smile at the possibilities.
This will be really fun...