[Okuva] Create it! The Best Medicine! The Great Experiment (2D Comic Magazine Nipple Fuck de Acme Jigoku! Vol. 2)

A mad scientist's daughter turns her own friend into a lab rat, strapping Aya naked into a machine built to test the 'best medicine'—a device that drills spinning attachments straight into her nipples. Betrayal melts into cross-eyed, drooling bliss as Aya's breasts get fucked into oblivion and her mind shatters under wave after wave of climaxes. The real experiment begins when a rival researcher reveals her results trump Shinobu's thanks to her 'compatibility' with the broken test subject, proving it with her mouth while Aya begs for more.