My remarried wife has two daughters: her older daughter "Asuka" and younger daughter "Marina." Having grown up with little affection from a father figure, they innocently and sincerely call me "Daddy! Daddy!" with pure, radiant smiles. Their still-developing chests slightly visible, they unconsciously flash clean underwear as they walk around me defenselessly. One day, the sisters catch me secretly having sex with their mother, and boldly demand, "We want you to do the same thing with us." Helpless against their innocent seduction, I instantly cross the line. From then on, I continue a forbidden relationship with these curious, pubescent sisters behind my wife's back. As the bond deepens, I'm increasingly torn when the two stepdaughters ask, "Who do you like more—our mother or us?"