Sexfriend
English name: Sexfriend
Genres: Hentai
Type: OVA, Episodes: 2
Aired: Jan 22, 2004 to Apr 23, 2004
Studio: Shinkuukan
Source: Visual novel
Rating: Rx - Hentai
Synopsis:
Tomohiro Takabe is suprised one day when Mina Hayase tells him she wants to be more than a friend. Instead of being her boyfriend, Tomohiro is going to be her "sexfriend". With the help of the school nurse, the two spend their days in the nurses office. The two then decide to further their friendship by trying out some new ways. 

(Source: ANN)