Charm Point 1: Sister's Rondo
Genres: Hentai
Type: OVA, Episodes: 1
Aired: Nov 30, 1999
Source: Manga
Rating: Rx - Hentai
Synopsis:
Two sisters attend the same college, one as a teacher and one as a student. Both of them, however, date college boys the same age. The younger sister has a big problem, because her boyfriend never seems ready to satisfy her. Her older sister`s trouble is just the opposite!

(Source: AniDB)