Gitai Saimin
English name: Alien Hypnosis
Genres: Hentai
Type: OVA, Episodes: 2
Aired: Jan 14, 2011 to Apr 20, 2011
Studio: Y.O.U.C
Source: Visual novel
Rating: Rx - Hentai
Synopsis:
Shinta is just an average student. But one day, a tentacle-shaped alien suddenly parasitizes in his penis. Shinta complains about it, but the alien answers there will be no problem because it can mimic. Shinta decides to satisfy his sexual desire using this power....

(Source: Eroge Shop)