After the shower incident, an obsession grew inside of me. Lia's hushed words outside of the bathroom door kept swirling around in my head. "It was amazing... and hot... and he's not my real brother." She obviously wasn't disgusted, or repulsed by my show. On the contrary, it may have been a turn-on. I wondered if her panties got wet. I wondered if she reached down between her legs and rubbed her clit, at some point. Her...