タランチュラ娘

An insect-based monster. Though she holds the ability to create webs, she chooses instead to attack her prey directly and use her silk to deprive them of freedom. She usually sucks out all of the body fluid of her prey, but if she particularly likes the man, she will mate with him instead. The peculiar structure of her spinneret is able to act as both a normal spider’s spinneret and as a female vagina that can force men to ejaculate with surprising ease. She is able to manipulate her spider silk inside her own body as she uses it to stimulate the man. Even after mating with a man for reproductive purposes, she will almost always eat him anyway. There have been cases of a Tarantula Girl keeping a man as a partner for life, though. [From In-game Monsterpedia]