Anime Sex - Chu Shite Agechau Oshikake Onee San No Seikou Chiryou 02

Based on the erotic game by Syrup: Honey Sweet. Segawa Akira is a high school student who is caught masturbating one day by his older sister, Yuu, who subsequently assists him in resolving his sexual desires. Later that day, Akira speaks with Yuu, causing her to meet with Tachibana Kimiko, a physician. Kimiko explains that Akira is suffering from an ailment that can only be cured via sexual contact with him. Thus begins Akira's new sex-filled existence with his sister, Dr. Takamori Sana, and childhood buddy Takamori Sana.