[Hirowa Nagi] The Circulation Tool ([Anthology] Inyouchuu Shoku ~Ryoushokutou Taimaroku~) [Kuraudo]

Two men argue over abandoning their current sexual reliever, a girl whose body has become a swollen, overfilled vessel for their pleasure. They decide to repurpose her as a living conduit, using tentacled devices to circulate and transfer bodily fluids between parasitic worms inside her. The tension builds as the girl's resistance wanes and the invasive process promises a more extreme, visceral climax.