After sending my sister in law to her field trip, I find Airi, my sister in law's classmate, standing next to me.

Airi was unable to go to the field trip because of fever, and I somehow happened to live with Airi.
I am an emergency teacher as well as Airi's teacher.

I can't make any mistake to keep my face up for my lovely sisters in law.

However, giving private lesson to her and living together with her... can I hold my desire from Airi's seduction any longer?

[From DLsite English]