In this adult sibling role-play, Suzu's enormous breasts block her view while she practices the keyboard harmonica, just as they make it hard for her to see the stairs. Her brother offers to help whenever she needs him, then asks for a favor in return: use those magnificent breasts to make him feel good. Suzu wears a short-sleeved sailor uniform and shows off her 109 cm J-cup bust before the bare sex and creampie promised by the title.