I am looking for a fic i knows i saw on AO3, archive on your own. The story was about dean being consort of Sam in Hell, and giving birth to the antichrist. Later their son is so jealous of Sam that he do anything to piss him off and often spy on his parents making love. Later their son falls in love with Ben and made him live in hell as his consort.

Ring any bell ?

Found in comment :-)