Kazuhiko's father has just recently married a beautiful young woman named Misako and he dreams of his new mother all the time. While Yosuke, his father has remained cool to her and her needs, Misako has been getting lewd calls and gifts of sex toys from that same person. Soon, unable to hold herself back, Misako finds herself trapped within Kazuhiko's power and willingly places all of her physical needs in his care. But Kazuhiko is not satisfied with just his step-mother. He has also set his eyes on Emiko, Misako's little sister. In an unforgivable secret triangular relationship, it is a secret that must be hidden from Yosuke or the cost will tear the family apart.
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(Source: Anime News Network)

Taboo Charming Mother