Becoming Less Defined (Built Another World #1) by silver9mm

Becoming Less Defined - silver9mm

An entertaining fanfic in which Dean and omega Jensen switch universes. Dean is unable to convince Alpha Jared that he is not a psychotic Jensen and Dr Alistair provides the drugs to 'treat' him. Meanwhile Sam falls under the spell of omega Jensen in heat.

'Jensen latched onto him and would not let go. Arms around his waist, the kid held on with that incredible strength Sam encountered earlier and he was as good as trapped on the bed. The scent Jensen was giving off was dizzying—sweet, comforting, arousing—was tickling some part of his brain where he stored sin.'

Source: http://archiveofourown.org/works/2141112?view_full_work=true