"Now, one of you will be cuckolded right in front of you." This is the plan that was announced suddenly. A familiar, close lesbian couple tries a new form of lesbianism - swapping. Their best friend gets cuckolded right in front of their eyes. They are made to cum by another girl while feeling their best friend's gaze. They experience complicated feelings for the first time through swapping. And then, the lesbian sex they have afterwards is even more exciting than usual...