Boku no Seiso na Mama ga, Konna ni Inran na Wake ga Nai! (jap/eng) by Appetite - Adult Sex Game

I was running through the underpass when suddenly it began to rain.
After sheltering from the rain for a while and calming down a little, I heard something at the far end of the passage.
Maybe it's people moaning? From the depths of the passage, I heard a woman's voice.

(No way... in a place like this?)

It doesn't matter that few people pass by, it's too bold to do something lewd in broad daylight.

(Ho, are you really... doing something indecent...?)

I descended the stairs, my footsteps were stealthy.
I peered into the back of the aisle, catching my breath.

The woman lay on the man's back and swayed her hips.
Both of them were wearing clothes so I couldn't see their hiding places, but they were definitely doing something perverted.

(Oh God... I'm on the edge!)

The man is increasingly aroused by the woman's wild use of her thighs.

I heard a woman's voice caressing that man, and suddenly I thought...

"Hey... I've heard that voice somewhere before..."

It's not just "I've heard that somewhere before". I hear this voice every day...
"Mother!!!"