For the first request, there's the fabulous 'Never Be', althought it isn't Bottom!Sam I'm afraid (if I remember correctly, since I most of the time couldn't care one way or the other :P) but I'd say give it a try anyway, since it's wonderfully written.
http://fluffandfold.livejournal.com/15258.html , or if you don't want to friend to author for the second part there's this link: https://docs.google.com/document/d/1gzwNssT8IzG-wJDq1uLKqz87PVcpzEv1NRALrZkao2E/edit#

Also, I'd recommend you look through the other entries tagged with WIAWSNB; there's quite a few with silimar requests and really good stories being recced :)

thanks for your help!
actually I don't care who's bottom or top, I only prefer Bottom!Sam XD
so I'll give a try anyway, no problem! thank you for this :)

I have a Cas/Meg one called Queen of Heaven that basically involves Meg using Dean to manipulate Cas into making her his consort, set between seasons 5 and 6:

http://xpnkitty.livejournal.com/5228.html