Hot, Sweaty Sex With the MILF Next Door

In the old apartment where protagonist Shuhei lives, single mother Kyoko and
her son, Ohharu (a young boy), live next door.

One day, when he helps Ohharu out in trouble, they become friends and
she treats him to dinner.
While Shuhei is enjoying a peaceful time next door, he accidentally
learns about Kyoko's masturbation habits and accidentally gets an erection.

Shuhei panics, but for some reason, Kyoko reaches down to his crotch and begins rubbing his erect penis.
The two try to caress each other without Ohharu noticing, who is engrossed in anime, but things
finally get out of hand...

They end up fucking until they're drenched in sweat, day after day, in the 4.5 tatami apartment!

(Source: Dlsite translated)