Is Shakkin Shimai hentai?
English title: Debt Sisters
Yes
Rated Rx (Hentai) on MyAnimeList.

OVA · 2007 · 2 episodes · Rx - Hentai
Hentai, School
Kaho and Kasumi are sisters indebted to the yakuza. A student learns of their predicament and decides to pay off their debt for a certain price; they must become his sex slaves until he sees that their debt is clear.
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