Bite Down by EclipseWing

Bite Down - EclipseWing

4.5 stars. An entertaining trip across post zombie apocalypse America with Peter and Stiles. Sex occurs off camera (makes a nice change!)

"The bite is a gift," Peter speaks those words like a revelation, enraptured by every syllable, "And I like you, Stiles. You're the clever one, the most dangerous out of all your little friends. Scott might have these things called morals, but you and I, Stiles? We live in shades of grey."

Source: http://archiveofourown.org/works/4604127