Brother swaps into sister in this gender transformation. You bring your sister breakfast in bed and it happens to include a secret formula you found on the dark web. You don't actually believe it will work but as soon as she's done eating, you're in your sisters body and your body is on the floor. Your mom hears you talking to yourself and asks if you're alright. You then realize you need to keep your thoughts in your head and your moans as quiet as possible. This turns out to be difficult as you have the most intense orgasm you've ever felt while exploring your sisters body. (body swap, gender transformation, transformation fantasies, transfer fetish, magic control, taboo, sister, trigger word)