“I also want you to fuck me like my sister!”
Aina discovers that her sister Reina has become her stepbrother Shouta’s “sexual pet”. Unable to bear that Reina has him all to herself, Aina finally sneaks into Shoota’s room during the night… to seduce him herself?!
Trying to take the initiative with the techniques she learned spying on Reina and Shouta’s encounters, Aina believes she can take control, but soon a great wave of pleasure overwhelms her, making her unable to contain her excitement.
Thus, together with her sister Reina, Aina also begins to be trained and subjected to Shouta’s “education”…