Every night, the sounds of married life echo through the house, and it's clear both want a child. One day, unable to hold back, I sneaked into the bedroom and was stunned to see my brother's mechanical sex—only to lock eyes with Eimi, my sister-in-law. That night, she seduced me into creampie sex, and ever since, after every encounter with my brother, she's come to me, craving my sperm. If Eimi becomes pregnant, will the baby be mine or my brother's? The truth is driving me mad.