Bridging the gap
For seventeen years, Dean has struggled with the fact that he is Unpresented. He has no scent and no soulmate and bullies like the rich and traditional Castiel Novak love to ridicule him. His own father is disgusted by him and his teachers pity and ignore him, so one day, Dean finally snaps. A satisfying punch to alpha Castiel's jaw later and Dean is horrified to find he presents as an omega.
Castiel's omega.
...Wait, why is Castiel baking him a pie?