[Hikoma Hiroyuki] Sisterly Love (Gouin ni Kusogaki Mesuana Dochutte Mita (Wara))

A protective older sister senses something wrong with little Madoka and vows to shield her from bullies—never suspecting the real predator wears a teacher's face. Bound tight with rope and silenced by her own striped underwear, young Himari endures the bald instructor's relentless assault, her bratty defiance crumbling as he ravages her mouth and body in a merciless mmf threesome that ends with him finishing deep inside. Sisterly devotion collides with predatory cruelty in this dark tale of a sixth grader's stolen innocence and a family bond that arrived too late.