Full view, please
Stella: We just got a new spell each! I'll try it out first! (Shoots the Star Growth spell at Luna)
Luna: Alright! I feel more powerful, and I'm growing bigger and bigger! I'll try Lunar Growth on Stella later.
Stella: It's a deal!
Here, Stella makes Luna grow to a giantess, but don't worry, she was willing to be the guinea pig! It also lasts for 24 hours, just like the Star Shrinker and Lunar Shrinker.