After a long day hanging at the park, you sit down with your bubbly little sister and show her some memes on your phone... and make her pee herself

You’re attending a required ed class. However, student demonstrations are mandatory. That is, to mixed reaction: some are skeptical, though some are happy to proform for the class.

Your anxious and clumsy step-sister Sarah has been having more and more accidents, but your parents are gone for vacation, and you're forced to take care of it yourself.