Yumiko Mama to Tonari no Masao-kun

Yumiko is just another housewife with an ordinary life. However, because of her husband's impotence, she couldn't even tell just how sexually frustrated she had been. One day, through a small accident, she gets to see her virgin neighbor Masao's cock; he's packing, unlike other boys his age. She gets so hot and bothered she can't help herself and despite playing shy, she starts touching him! At that point, even though her husband comes back home, they're too far gone to stop, so they do their best to keep quiet as they play with each other. They even end up fucking while he's right next to them! Luckily, her shortsighted airhead husband didn't notice a thing, so they can keep enjoying the thrill of having sex behind his back. To relieve the stress she's been living with for years, Yumiko keeps raising the bar for how intense their encounters get. What will turn out to be her ultimate thrill...?!