After the lesson was over

Junko and Sayaka had to wait a long while until they could start their plan.

Once Aoi's lesson was over, everyone started to leave the pool, eventually, everyone but Aoi and Chihiro had left the pool. Aoi was spending some more time teaching Chihiro how to swim better.

While the two were still swimming, Junko and Sayaka were waiting in the locker room until everyone else was done changing before they could start their plan.

Chihiro and Aoi had no idea what awaited them.