Anna couldn't help letting a grin start to peek through on her face. Not a deliberate one, but one that fought any attempt to resist it and showed itself anyway. It was a brief glimpse of the girl under the carefully constructed exterior she liked to project.

She leaned toward me and we kissed again, for longer this time. Our hands went to each other's bodies, though in relatively tame locations. I was all set for making out with my sister a little, and as far as I could tell she felt the same way.

Suddenly she pulled away. I started to speak, but she put her finger to my...