Gitai Saimin  

Mimicry Hypnosis, 의태최면, 擬態催眠, Alien Hypnosis

Shinta is an ordinary student until he experiences an unexpected event when a tentacle-shaped alien attaches itself to him in his genitals. Despite expressing discomfort, the alien assures that there will be no issues as it can replicate. As a result, Shinta decides to use this ability for sexual gratification.