Futago no Haha Seihonnou  

Futago no Bosei Honnou, L`instinct sexuel des mères jumelles, Menage a Twins, Menage de gemelas, 쌍둥이의 모성본능, 双子(フタゴ)ノ母(ハハ)性本能, 双子ノ母性本能

One day, Minoru received an email that was sent to the wrong address. This was the first time something like this had happened. The sender's name was Akane. Although he didn't know her well, there was a sense of familiarity with her. The next incident occurred when Minoru and Tomoe returned home from shopping. They saw Akane on their way back. Tomoe looked serious as they approached each other. Were their encounter accidental or intentional? When their relationship was revealed, Minoru became anxious and couldn't help but stare at them sexually.