Based on the storyline of Aneki... My Sweet Elder Sister: The Animation

A young man named Mamoru is caught by his older sister, Yuki, while acting on his attraction to her in her room. Instead of standard discipline, she initiates a sexual encounter that reveals her own feelings.

, here’s a concrete action plan:

Several characters, such as the sister (who is a teacher) and the swimming instructors, maintain a strict, proper persona at work but exhibit lazy or "slovenly" habits at home.