you were just in the room with Loona and Millie, Millie was using the new book they had found and made her own breasts expand slightly, she showed Loona

Millie: Loona look!

Loona: wow, that is very cool millie...that sure is a neat book you got there Millie

She says as she is on her phone doing whatever still, Millie got upset....then got a big idea, then she gave you a signal to go to the back of the room, and then she put both her hands on Loona's breasts, which she growled at Millie for at first...but then after a few more seconds on looking on her phone...she noticed her breasts inflating

Loona: oh fuck

then BAM, Loona breaks the entire wall to the front side of the I.M.P building...Loona's breasts were like massive blimps now...then Millie slaps her ass...you know what's gonna happen now, cuz Millie also had that same magic that made Loona's breasts massive blimps...and Loona just groans and growls at the same time