[Kawai Shun] Dance! Tentacle Research Institute

Kawai Shun's Tentacle Research Institute opens with two nude researchers already bound in writhing pink coils, and things only spiral further from there. Inside the lab, one scientist nervously asks her specimen to 'go easy' since it's her first time, another ends up wearing the experiment as living clothes, and when the secretary dons a suit of tentacles herself to chase down the director, the whole institute collapses into a wriggling group free-for-all. Eggs, milking, impregnation, and double penetration abound as the staff discover what it feels like to become the research.