ナメクジ娘

With her body that of a soft slug, weak attacks will get stuck in her mucus covered membrane. The Slug Girl's behavior is to take walks at night and attack any men she encounters. Like most monsters, her staple food is male semen. Using the lower half of her body, she carefully stimulates her catch to feed. Once she catches a male in her slimy mucus membrane, they are forced to ejaculate with surprising ease. With that, she is able to feed. In addition, if the Slug Girl particularly likes her catch, she will use the genitals in the slug half of her body to mate with her prey. Using the same techniques as feeding, she will force the male to release just enough semen for copulation. Once a suitable male has been found to copulate with, the Slug Girl will continue to use him as both a mate and a source of food for the rest of his life. [From In-game Monsterpedia]