Two Different Memories When I was 19 and Kendra was 18, we were alone in our parents' house, lying on our parents' bed watching TV. We only learned recently that we're half-siblings — her father is actually my father's brother — but back then we were just brother and sister, close in a way that had always set us apart, even in a house that was already dysfunctional enough without us adding to it. She was in front of me, both of us on our sides. I felt it before I did anything — a vibe, like electricity running straight through me. My heart was pounding. My hand was actually shaking when I reached out and put it on her waist, just above her hip. The second I felt her body under my hand, I knew how aroused I was. She turned fast. I yanked my hand back, sure she was angry. She wasn't. I saw it in her eyes and she saw it in mine, mirrored right back, and we fell into each other. We kissed, hard and clumsy and passionate, and dry-humped there on our parents' bed. We...