My Adoptive Sister Won't Stop Flirting With Me

When your gorgeous adoptive sister starts dropping hints about confessing, what's a guy supposed to do? She's three years older, drop-dead beautiful, and definitely not taking no for an answer. "We're not blood-related," she reminds him with a mischievous smile. "No laws broken, no morals crossed." But he's not sure he's ready for his campus queen sister to turn their relationship upside down—even if she's determined to make him fall as hard as she already has.