Rumor Has It by Fox Murphy on FanFiction.net
http://www.fanfiction.net/s/5299206/1/

Summary:When Kingsley and friends hang out in the library, school work is often the last thing on their minds. Gossip is gossip, especially at Hogwarts. Special appearances by Frank and Alice Longbottom, Marlene McKinnon, and Edgar Bones. Marauder's Era, year 5.
Rating: T
1 Chapter/Oneshot

I really enjoyed the characterization the author put into some of the less featured characters of the series, and their conversation/dialogue works wonderfully. If you enjoy reading Marauder Era fics, you'll enjoy reading this even if the main characters we think of for that era are only discussed.