The first one is a one shot. An angel tries to kill Dean but Castiel steps in front of him. Sam and Dean think that Castiel isn't really dead as there are no wing impressions on the ground. When dean takes a shower he finds the wings on his skin as Castiel had his wings wrapped around him when he died.
The second is an alpha/beta/omega au.
Castiel is an omega and recently found out he's pregnant. He's scared Alpha Dean wont want the pup so Benny offers to look after him and the pup if Dean doesn't want to be involved. Benny had previously lost a mate and pup.
Dean finds out about pregnancy and assumes Cas is leaving him as he thinks he wont be a good father. Cas and Dean talk it out and decide to raise the pup together.
There is also a scene where Lisa who is Deans ex sends them baby clothes and it upsets Cas as it has her scent on them. Dean realizes and gets rid of them.
Thanks in advance for your help :)