User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-10750309-20130718140216/@comment-6068707-20130719012739

true and also in many interpertations of the Oracle, its said if they do fall in love and condem themselves to act on that love, the powers of the oracle shall be shattered causing the oracle to die out with them.

But besides that, come on Octavian doesn't seem to care much about romance, he's more like into power and leadership than romance or girls. I mean he would rather bicker and argue with Reyna and lets not forget blackmail Hazel than be with any girl. Even if theirs a slight chance. But he might think it's "Cute." that she's the oracle.