The younger sister took her lover home to play and then led her into the room to have sex, Amiri Saitou's sister took a curious peek and saw that it was turned off, watching her sister suck so that her lover's penis made her want to do the same. Because she was too "hot", her sister took the initiative to seduce and squeeze her sister's boyfriend out to suck as soon as he went to the toilet.
Served by his lover's sister who is both prettier and tastier, making the young man caught up in and secretly having sexual affairs with his lover's sister.