SDDE-641 Helping Older Sister Recover Memory With Sex And Creampie

Yudzuru has an older sister named Rika who used to be a bright and cheerful SDDE-641. However, after she developed a condition, everything changed. Now with her brain half-toasted she spends most of her time at home while attending therapy sessions.

Yudzuru helps her out with everything he can, and she rewards him with sex… and creampie… all she knows now. A bittersweet story based on a doujin named “Mukashi Wa Kakko Yokatta”.