Concentrate. That's what she needed to do. Natasha really wanted to make the butterflies the exact way she pictured them, and also non-verbal. It'd be tricky, but she could try, right? Concentrate.

Concentrate. She held her eyes closed, picturing four beautiful pink birds in her mind. Papilio! She thought, thinking it as hard as she could, swishing her wand. Tasha opened her eyes, frowned when there were no butterflies, and closed them again.

CONCENTRATE. She had a vivid mental picture of them, she just needed to THINK. Hard. Papilio! Papilio, Papilio! She repeated in her head, thinking of the butterflies. She slowly opened her eyes and was completely surprised.

YES! They were there, the four, beautiful shimmering in the light, butterflies. She'd done it non-verbally. She grinned to herself, feeling quite proud. She LOVED Transfiguration.