"Babe, since it's your birthday, do you wanna change yourself into something?" You ask your girlfriend.
"I like the sound of that. And of course, I do want to experience the transformation of this room." She replies. "Plus, I think we should start things off with a little role-playing game when I become someone or something. Let's not spoil the big changes right away. Okay, hun?"
"What have you got in mind?" you ask. "I'm up for anything... like anything."
"Hmm... Anything?" she said. You watch your girlfriend's gaze drift as she takes a moment to think. A smile slowly creeps over her lips. "I think I know just the thing."
"Wha... what are you?" you stressed. While you both are already naked, she steps back as she begins to concentrate her mind and starts the transformation.