For 1 I think you're talking about cloudyjenn's story Not usually a Good thing (http://cloudy-fic.livejournal.com/39387.html) and for 3, try Catching a Clue, or Five Times Dean and Cas Are Mistaken For a Couple (http://community.livejournal.com/deancas_xmas/38365.html#cutid1)

Or it could be this one.

http://cloudy-fic.livejournal.com/47547.html

2. Not Lisa's POV though, but their neighbors.
Dean and Cas vs Elm Street (http://community.livejournal.com/deancastiel/1030762.html)
Summary: It's a sunny summer day when a sleek black car plowing down Elm Street. It stops, just outside of the, until now, empty house across the way. The two men wait patiently for the moving van, believing they are settling down in a quiet and peaceful neighborhood, but the new arrivals catch the attention of the neighbors, there's the housewife, the conservative couple, the teenager, the old woman, the playboy, the young boy, the newly out man, and the brother ,all who have something to say about this interesting and potentially scandalous situation.

Fantastic stories.

2.
Four Times Dean Winchester Did A Very Poor Job Of Hiding His Feelings, And One He Didn’t by janie tangerine. Uriel, OMC, Bobby and Sam as the other POVs.
http://community.livejournal.com/deancas_xmas/14614.html#cutid1

Bubble, What Bubble? (Or, Six People Who Wish Dean and Castiel Would Catch A Clue) by kira bouieva. Bobby, Uriel, Sam, Jimmy, Zachariah and Chuck as the other POVs.
http://community.livejournal.com/deancastiel/906274.html#cutid1

The World As She Saw It by Antiquitydreams. Lisa's POV.
http://community.livejournal.com/deancastiel/2043413.html#cutid1