Their son moved into a one-room apartment in the city. His parents, worried about him, took the train from their hometown to check on him. Seeing the messy six-tatami-mat room, his kind stepmother Yui chuckled and efficiently tidied it up. Later that night, his father had to unexpectedly return home, leaving Yui to spend the night at her stepson's apartment. As they slept side-by-side on futons in the small room, her son's cock couldn't help but stiffen at the sight of his stepmother's aroused body...
