HBAD-306 My wife's younger sister is seducing me... Aki Sasaki

Aki comes to stay at her sister's house to meet her friends in Tokyo. However, while her strong-willed older sister is harassing her about her future, marriage, and pregnancy, she begins to think that she should somehow look back at her older sister and calm down her drinking habits... So, she gets pregnant earlier than her sister and takes action to seduce her sister's husband...