>>171347
If you're looking for a video idea, here you go:
Sanae is hosting a new event to raise funds for the Moriya shrine, where she's dancing up on a stage for everyone to watch and leave donations! There's a twist she's not aware of though - as viewers leave donations, the power of their faith fills Sanae's chest, causing her breasts to grow! She dances for a bit, oblivious to her tits slowly expanding, until a big donation comes in and causes her breasts to grow in a big pulse. This shocks her, causing her to stop dancing for a bit as more people start making big donations, causing her top to start opening up as her boobs aggressively grow larger and larger. But the show must go on, so Sanae starts dancing again, made difficult by how much larger her boobs have grown and how embarrassed she feels. Soon her breasts, wrapped in bandages, totally emerge from her top, and after that her nipples start peeking through the gaps in her wraps. Sanae tries to cover her nipples with her hands, but her breasts grow so big she can't reach them anymore, ripping off her wraps and leaving her totally red in the face as she bashfully keeps dancing. After some more big donations, Sanae's tits grow so big they touch the ground and she can hardly move anymore... Sanae struggles to try and lift her breasts back up, pressing them with her arms and legs, but this triggers the final act of her show - huge amounts of milk start gushing from her tits! Giving into the feeling, Sanae falls to her knees as donations come in at their highest rate yet, as her boobs grow and grow until they completely fill the stage she was dancing on. Her boobs appear to stop growing, far bigger than the shrine she's raising money for... but just as soon as she catches her breath, donations start coming back in!
Briefly: breasts (expansion)