Specific fic search - FOUND

[anesthezea]

Looking for a specific Dean/Cas fic told from Sam’s POV. Sam, Dean, and Cas live in a house together and Dean and Cas are a couple. Sam meets a girl and at some point tells her that D/C are both his brothers. She’s a neighbor and sees D/C cuddling in their backyard and thinks there’s an incest thing going on and she tells Sam she can’t be friends

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[gilesbabe]

That is 'A Wincest Story' by trinityofone. Summary: When he listened to their former angel pronounce his new official human name over and over, first giddy, then reverent-“Cas Winchester, Cas Winchester”-Sam couldn’t shake the feeling that this was somehow going to come back and bite them in the ass.

https://archiveofourown.org/works/995919

[anesthezea]

That’s it! Thank you so much!