Can't go back

Teenlock! Like I said before, I don't usually do AUs, but I had the sudden urge to do a teenlock. I sent this to a friend and asked her to come up with a title with me, but she hasn't responded yet. I just put in a line for later, but if any of you have ideas for titles I'd love to hear suggestions. Later chapters to include Johnlock.

Cover art by http://cinnamonplayground.tumblr.com/ who was amazing enough to let me borrow it.