After-school remedial class meant Rion-chan had to receive one-on-one instruction from her teacher. On-chan, it was clearly a lewd trap set by a lustful predator. No matter how many times she pleaded "stop," resistance was futile in an empty classroom with no other students around. Taking advantage of the situation, the teacher forcibly initiated perverted acts. With no way to escape, Rion-chan gradually began to feel her emotions stirred. Eventually, she started wishing—of her own volition—for the teacher to abuse her, transforming into a submissive pet who obediently obeyed.