Finally, I thought. The relief flooded me. I adored having sex with my sister, but everything we were doing, the risk we were taking, I couldn't handle the stress.

"I need your warmth," Betsy said, "And you need my... well, we both know what you need."

My sister said this like I was the perv in the relationship. As if she wasn't just as horny as me.

"No silly," Betsy said. She slapped my hand, playfully. "Affection. Comfort. You said it yourself. You want that closeness that only we can have."

"Oh right," I said, "Sorry."

"But we're going to start school and it's all going to have to end,"...