https://www.pixiv.net/en/artworks/148762486

Hikiko, the mother, is caught by her son while he's changing, and impulsively allows incestuous sex with him 🏡💕
Hikiko is treated like a slut on her commute and at her part-time job, and is exhausted every day (though she enjoys it a little)...🦜💕

Her son notices the stain on her underwear, which smells of a man, and peeks at her while she's changing...and then forcefully engages in incestuous sex with her, including a passionate kiss...mother-son sex ❾...💕

And then, finally, her mother's egg and son's sperm combine...she even allows the forbidden act of mother-son fertilization...🏡💕