Sam was deep in my head - jacked into my fantasies and feeding them jet fuel. All of my buttons were getting pushed at once. I was writhing in a mix of imagined urges. A righteous urge to protect - a taboo urge to fuck - a sister I never had but who was right here underneath me.

Sam's slid her hands up from her own crotch, one flung loosely on the bed above her head. The other grabbed the bottom hem of her t-shirt and pulled it up, way up, until it was bunched around her neck. It revealed the flat, tight, olive skin of her stomach and her...