[MIDE-957] My dear sister, when you go out with friends alone, remember to take care of yourself

A secret sex movie of Nao Jinguuji, the younger brother is worried about his older sister’s trip when she goes on a picnic with a group of pretty bad looking friends. He is worried that she will be raped, and that is true when she is dragged to a corner by a friend in the group to fuck, after fucking he also invites his friend to join in a threesome. But too happy she also forgets her promise to keep her body clean and not let anyone fuck her except her husband and younger brother, and goes wild with no way out…