A secret from my wife, JK anal training ~Teaching my wife's little sister how good anal feels~

Souichi used to fool around with women until he impregnated Sakurako. - A woman from a very distinguished family. With no way out, he had no choice but to settle down and marry. - One day Sakurako's little sister, Kikuno, approaches Souichi. - Onii-sama, I have a very embarrassing problem. I suffer from insensibility, I'm sexual frigid, can you help me?. She says. - Souichi, having resigned himself to a life as a mere husband, feels delighted, "human resources" so close-by! - Kikuno is Sakurako's little sister, she must have "potential". Souichi thinks. - Souichi immediately begins training Kikuno into becoming an anal slave.​