In order to cheer Haruto up after his anime was such a flop, Itsuki gets him as well as Nayuta, Miyako and Chihiro together so they can play a TRPG. Itsuki usually plays girls in games, but for some reason, Chihiro makes out their character to be Itsuki’s character’s little sister, which leads to Nayuta and Miyako also making their characters sisters of the other two. Haruto becomes the GM and does whatever he wants.
As I devour Onee-sama's tongue, 
I gently untie the strings of her robe.
Mientras devoro la lengua
de mi hermana, le desabrocho la túnica…
Mientras devoro la lengua
de mi hermana, le desabrocho la túnica…
Tout en dévorant sa bouche, je défais
furtivement le cordon de sa robe.
Mentre assaporo la lingua della sorellona,
sciolgo gentilmente i lacci della sua veste...
Enquanto devoro a língua da Onee-sama,
eu gentilmente desfaço as amarras da sua roupa.
Без устали играя с язычком Мияко,
я потихоньку развязываю её одежды.