I see Dean as sub, too! But I was only talking about sex positions in this case.

For dom/sub I have:
Destiel: fixed Dean sub (ALWAYS with anyone) / Castiel dom
Buffy/Spike: switch
Hawks/Endevor: fixed Hawks dom / Endeavor super sub the subbiest of the subs
Victor/Jayce: switch
Ymir/Christa: fixed Christa dom / Ymir sub