Zero no Mono
English name: Zero no Mono
Genres: Hentai
Type: OVA, Episodes: 1
Aired: Oct 21, 2001
Studio: Studio March
Source: Manga
Rating: Rx - Hentai
Synopsis:
Steamy days and nights of sexual experimentation result from a glance among strangers passing in the street. A young man, enslaved by his own obsessive erotic wants, is magnetically attracted to an innocent-looking schoolgirl he observes outside of his home. Unable to control himself, he throws some of his most private bodily fluid on her, a liquid sign of his sexual desire. Surprisingly, she responds favourably to this bizarre come-on, and the two end up living in their own illicit world for the next several days. 

(Source: yahoo movies)