[Choushizen Kenkyuujo (Meido Sushi)] Himitsu Innyuu (Occultic;Nine) [English]

A schoolgirl finds herself overwhelmed by a massive, otherworldly presence. What begins with a surprising encounter quickly descends into an intense, overwhelming physical connection as the sheer scale of her partner becomes impossible to ignore. As the boundaries between human and something much larger blur, she must navigate the overwhelming sensations of a connection that defies traditional proportions, leading to a messy and breathless climax.