Sarah started to let everyone go and walk off the stage, but she noticed as everyone dissipated that one boy hadn't left. She suspected he'd be about to get furious with her and insist this was all wrong, but noticing his body language- his hands were awkwardly behind his back, his eyes looking at the floor- she realized he wasn't very confident about it if that's what he was trying to do.
Recognizing him, she said, "oh, hey Marshall! Have you decided to accept your inner girl already?"
"Um... yeah," Marshall admitted. "To be honest, I have something to tell you." He swallowed anxiously and said, "I'm trans."
Sarah's heart leapt. He had secretly been a sister this whole time! "Aww, that's awesome! I can see why you'd want to let your inner girl out already."
"Well, to be honest I feel about the same," laughed Marshall nervously. "I'm just so happy that now I can do something about it."
Suddenly, Sarah had an idea. She pulled a lipstick from her bag and purred, "Marcie, take off your clothes."
"Huh?"
"You wouldn't wanna miss seeing the girl inside you get released, would you?" she grinned.
Marshall realized she was right, and he quickly stripped off, standing there naked as she painted his lips. Instantly his body accepted the will of his inner girl.
Having his inner girl awoken was the best feeling Marshall had ever felt, it was like she was a butterfly emerging from the chrysalis of her boy self. His skin softened and his proportions feminized, making him shorter, curvier, lither. His hair lengthened down his back as the hint of body hair he had elsewhere vanished. His nipples perked up and grew more sensitive as his chest swelled and sprouted, soft breasts on his previously flat chest. And as one part of him moved outwards, another moved inwards- his testicles were sucked up inside him, and his scrotum slowly split into labia, while his penis shrank away and turned into a sensitive clitoris, until all that was between her legs was a feminine mound.
Her. She was a girl. Marcie was delighted at how her new body looked, and hugged Sarah, feeling like she might cry. "Thank you," she mumbled in her new, higher pitched voice.
"You're welcome," Sarah replied kindly. "You look really pretty. But you should probably put on some clothes!"