[GNAB-024] Body Swap: Brothers and Sisters.

A mysterious interviewer invites brothers and sisters who attend the same school to take part in what appears to be an innocent interview inside a private room. At the end, he asks them to try a strange mobile app that, without their knowledge, swaps their bodies.

To return to normal, they must either wait 48 hours... or speed up the process by raising their synchronization rate to 100%. To achieve this, both siblings must reach climax together.