Tickling Test — Subject: Kakudate Karin (角楯カリン). She is locked into a high-tech fetish machine built to measure every reaction. What begins as a simple sensory test quickly escalates into an intense experiment involving foot odor, forced teasing, tickling, restraints, and overwhelming stimulation. Each stage pushes her limits further as the machine records every change in sensitivity and arousal.

Creator / Pixiv: desuwa — https://www.pixiv.net/en/users/119026709