Sam/Dean Lactation Fic
i have been looking for this for weeks. I remember the fic being on ao3. The plot was that sam (omega) and cas (alpha) were married with dean being their son. After dean watches sam breastfeed (not him but a brother, maybe) dean asks to taste and that continues. There's a chapter where sam puts on an apron and dean says he looks beautiful. Cas is jealous of the relationship between his omega and his son. Dean starts dating someone at school temporarily but sam gets mad. This was many years ago so it wouldn't have been updated recently.
Mods: I could not find a lactation tag, but I think that's a big part of the fic I am looking for