Binetsukko ♭37℃ The Animation
Japanese title: 微熱っ娘　♭[フラット]37℃　THE　ANIMATION
Alternative titles: Binetsukko flat 37, Binetsukko b37℃
Type: OVA
Source: Manga
Episodes: 2
Status: Finished Airing
Aired: Nov 28, 2003 to Feb 27, 2004
Duration: 27 min per ep
Rating: Rx - Hentai
Studios: Maboroshi Koubou
Producers: Pink Pineapple
Genres: Hentai
Themes: Harem, School

Mutsumi Kagidou finds herself being blackmailed by a perverted student, Inuhiko. The blackmail material? An embarrassing photo of her. In order to get the photo back, she becomes Inuhiko's sex slave and they have all kinds of debauched sex. After a while though, Mustumi tells Inuhiko to forget about the photo since she doesn't mind being his sex slave anymore. And so, a 'unique' relationship is formed between the two of them. 

(Source: BakaBT)