Elfina: Yoru e to Urareta Oukoku de... The Animation
Japanese title: エルフィーナ～淫夜へと売られた王国で…～THE ANIMATION
Alternative titles: Elfeana, Elfina: Servant Princess
Type: OVA
Source: Visual novel
Episodes: 3
Status: Finished Airing
Aired: Aug 22, 2003 to Jan 23, 2004
Duration: 29 min per ep
Rating: Rx - Hentai
Studios: Himajin Planning
Producers: Pink Pineapple
Licensors: Media Blasters
Genres: Fantasy, Hentai

Elfina lived a life of luxury as a member of the royal family. She was waited on hand and foot and had a team of servants. That was until her country was invaded! Now Elfina must comply to the sexual demands of her new masters and it doesn't matter how humiliating or intimate the favors! 

(Source: AniDB)