guinea pig 1 (Pixiv Fanbox)

Professor Zweistein has always been known for his perverted medical experiments on women. He lost his job several times because of it and was almost arrested a few times. But in the bioweapons lab in Ghost City he can perform all his torturous inhuman tests without anyone questioning anything. Here he is conducting a test to see how much bull semen a woman can swallow with her anus plugged with a huge dildo. Currently, Nina has swallowed 12 litres and is suffering excruciating pain. Which doesn't interest the professor in the least. For him, Nina is just a guinea pig that can be used without pity. Like all the other women in his experiments.