Shokushu no Naedoko ni Natta Onna-tachi

One night at a party, Marie takes Scarlett and Lian to see the World Tree underground. There, due to Marie's carelessness, the three are captured by the World Tree. They are violated by tentacles, and a special semen is poured into their wombs one after another. Soon, their greatly swollen bellies are filled with countless lives... [Translated from the official website]