4.)

To You I Bestow by kyrene: http://archiveofourown.org/works/124839?view_adult=true
Summary: After John Winchester goes missing his sons, Sam and Dean, finish his Hunt in Jericho. Sam returns to school and his girlfriend, while Dean follows the coordinates their father left them and finds himself with a new Hunting partner. As Sam struggles to catch up with his older brother, even stranger things are happening to Dean. And suddenly finding his missing father is going to be the least of his worries.

Includes Mpreg!Dean, hurt!Dean, bottom!Dean, Dean/omc, and slight Sam/Dean. Awesome fic!