It sounds like you're referring to a specific scene or title from — likely "Mommy's Girl" — and you're commenting that it's a "good piece" (meaning a well-made scene).
is a premium adult studio focused on lesbian storylines, often with themes like age-play, taboo dynamics, and power exchange. "Mommy's Girl" is one of their recurring series or scene titles. The phrasing "When Did You Get So..." is probably part of the dialogue or the scene's promotional tagline.
To give you a clear, informative answer: