In this adult sibling role-play, the brother crosses the line while the parents are away. He begins touching his sleeping twin sisters and escalates all the way to sex, expecting to finish before they wake up. When Nenne and Miku discover what happened, however, they are delighted instead of horrified and confess that they have always wanted to fool around with their brother. A fierce fight over his cock begins, with both sisters competing to show off their bodies and claim him.