I've got some for you! These are all Wincest.

Opus Amore (http://archiveofourown.org/works/1515428/chapters/3203048) by skylee
Not Meant to Be (http://archiveofourown.org/works/2309393/chapters/5081558) by majesticduxk
Taste Every Fruit (http://archiveofourown.org/works/1180782/chapters/2407917) by thatsakitkat (mind the kinks)
Take What's Left Before It's Dragged Down to Hell (http://archiveofourown.org/works/1568969) by cinrose
In the Arch of the Door (http://archiveofourown.org/works/698149) by littleghost (contains mpreg)

Hope these are what you're looking for! ♥

Thanks! I didn't expect a reply so fast.

Fix me I'm broken
http://archiveofourown.org/works/3995092/chapters/8971531
John expected his eldest son to present as an Alpha, like himself, but when Dean turns out to be an Omega, there's more than just disappointment in John's eyes. Medication can take care of it, though, damp Dean's scent, mute his Omega instincts; and his heats...well, John can take care of those, too.
Sam hates listening from the room next door to what John is doing to his beloved older brother, and when Sam finally presents as the coveted Alpha, he fully intends to do something about it.
But are Sam's plans the best thing for Dean? Is there something John hasn't told them? Something deadly? And will they find out soon enough that there are reasons for everything their father does.

Fractured Bonds
http://archiveofourown.org/works/4511547/chapters/10261011
When Dean was 12 his very first heat turned out to be a brutal disaster. Complications result in Dean’s left damaged beyond repair, effectively a beta. Despite this, when Sam first popped his knot, Dean suspected Sam might be his mate. A few omega hormone shots and he'd know it for sure. But being a defective omega he didn't think he deserved any alpha, let alone his precious baby brother. Dean keeps his distance, and when Sam leaves for Stanford he knows it’s for the best. Except then John goes missing and Dean has to collect his brother…

I Need a Hero
http://archiveofourown.org/works/8682391
John claimed Dean as soon as the boy presented an omega. Sam claimed Dean as soon as he presented as an alpha. Only one alpha has rights to the omega, and he's going to prove it.

Opus Amore
http://archiveofourown.org/works/1515428/chapters/3203048
Sam and Dean go undercover at a couples retreat for Alphas and their Omegas to root out a monster. Dean hates being an Omega so the fact that he'll have to openly be one and stop taking his suppressants pisses him off. Still, the more they pretend to be a happy Omega and Alpha couple, the more he starts to think that maybe being an Omega isn't so bad, not if Sam is his Alpha..

Sacrifice
http://archiveofourown.org/works/8430193
Sam was just a little kid the day Dean disappeared.
It's been decades since and now he's a grown man and seasoned hunter.
But he feels like that little kid all over again when a young teenaged Dean suddenly appears.

The case of Dean (and there's a sequel)
http://archiveofourown.org/works/2386886/chapters/5273723
Sam is an alpha studying law at Stanford and is an omega rights activist. Dean is an omega who has been abused for years by their father. Dean is removed from his father's custody and Sam takes him in.
This work of fiction details a society where omegas are regarded as little more than animals. Sam tries to undo the damage society and their father caused Dean.

Thank you. Looks like I have a lot to read now. The last one seems to have all I'm looking for in A/B/O verse fic.

Mark of the beast. http://archiveofourown.org/works/997120/chapters/1973177

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