Peach and Rouge Rubber Suit TF

Second pic in the request series, this time it's 's idea of Peach and Rouge getting in an accident during a jewel heist, trying to steal Peach's blue ammulet she wears on her dress.

Unfortunatly, the device she uses causes Peach to merge with her rubber catsuit, pushing their molecules together into Rouge's suit as they both hollow out, fusing and gaining each others features (like a rubber skirt from peach, and a rubber crown, also cute rubber bat wings, boots and hearts from rouge)

However, I don't entirely think it was an accident that caused rouge's device to malfunction >> whats that box doing by their new form?