Kazoku: Haha to Shimai no Kyousei

Kazoku: Haha to Shimai no Kyousei. After Itsuki's mother left her father because he was having an affair, her father remarried. Even after remarrying, his father still has another affair and leaves Itsuki alone with his stepfamily. However, it's hard to hold back lust when at home surrounded by younger siblings, older sisters and an ageless, beautiful and plump stepmother.