Well, maybe Oga x Furuichi at first, but I think when the anime get to Toujou I think Oga x Touou supporter will increase as well...don't they usually like main character x their rival / archenemy? Maybe even Oga x Miki?
Anyway, I need to balance my mind now....Aoi x Hilda, Lamia x Oga's Sister, En's Nurse Trio x that two other red tails member...