Anejiru The Animation: Shirakawa Sanshimai ni Omakase

The story is about Yuu-kun, who lives in the same house with three charming sisters. They're into something very personal, and it also has a strange effect on the main character. To get rid of this influence, he needs to fill a vessel with a liquid that only the sisters can give. Yuu-kun had no choice, so he decided to take this step.