He cleared his throat and placed a privacy charm around them, trying to waste time as he thought of a reasonable excuse. Something Lily would buy...one of the theories Harry had denied?
"We're from another dimension." He explained, trying to appear stressed out (not too difficult, considering the situation.) "In my dimension, James and Harry are twins, you're dating James, and Snape is the biggest jerk in the school. We were suddenly thrown into this one--where some of us don't even attend Hogwarts."
Merlin, he was a genius. "We've been trying to keep it a secret, but it's difficult to communicate."