Breast Movement Miracle

In the year 2030, an infectious disease "Molu Molu" with a fatality rate of 99% swept the world, and only men were infected. The only antidote was maternal breast milk. Two couples, Xiang Gyu and Quan Shu, worked hard to get pregnant, but to no avail. Later, they learned that only by exchanging partners could they increase the chance of pregnancy...