1) The pairing in the first story was Dean/Castiel. Their relationship developed very slow, especially when it came to sex. There was this scene, where they finally wanted to sleep with each other and Dean bought condoms. Sam saw the condoms and came to the conclusion that Dean planned to cheat on Cas. Dean had to tell Sam, that he and Cas were about to sleep together for the very first time. Sam was flabbergasted ;)
FOUND!! Link in comments.

2) Another Dean/Castiel story. The fic was about Dean trying to hide that he is gay troughout his entire life. Sam knew about it all along, but didn't tell Dean. In one scene Teen!Dean was holding hands under the table with another boy. At the end Dean and Cas were together and Sam finally told Dean, that he knew all along and that Dean didn't have to hide anymore.

Any ideas? Thank you so much for your help in advance!
ronjamaus