Junko and Akira had no grand drama behind their immersion into same-sex sex. It just happened that the person Junko thought "seems nice" and made a move on was her younger brother's wife, and for Akira, it was her husband's older sister. Since both lived nearby, they had no trouble meeting up, which only deepened their involvement in this relationship. Today, too, after seeing her husband off to work in the morning, Akira immediately headed to Junko's house.
What a waste A considerable amount of screen time is devoted to the first half's story development, and it's a shame that the crucial sex scenes feel somewhat short. In particular, Mei Mizuki has many scenes where she remains clothed, failing to make full use of her beautiful body line. Even in the final sex scene, Mizuki stays dressed for much of it, leaving a sense of frustration. On the other hand, Kurumi Tamaki's relatively more exposed skin left a good impression.
I wanted to see more of them using strap-ons on each other, bringing each other to climax multiple times, and their intense writhing during scissoring. Both Tamaki and Mizuki have attractive bodies, and their vigorous hip movements in positions like cowgirl really shine, so that part felt lacking. Personally, I was left with a somewhat unsatisfying impression. I look forward to a future lesbian work where these two perform together again.