Fight for power!! Shinoda Ayumi, who slept with her brother's wife, NSPS-289

I love my husband deeply and would never betray him. However, our nightlife is... well, because my husband is impotent and completely unresponsive. Although I sometimes feel dissatisfied... my husband's older brother doesn't seem very likable, but his penis is incredibly erect... even knowing it's impossible, I still care a lot about him...