That's very similar to how it went for us. Our first Black Bull started making me perform bisexual sex acts on him (sucking, rimming, etc) to humiliate me and test my obedience, then it quickly evolved into me getting pegged and then assfucked by him, which was definitely humiliating for me since I'd always considered myself straight.
I have to admit though, at this point there's no humiliation for me, I actually look forward to getting BBC in my ass, the physical sensation of the orgasms I get from it are something more powerful than I have ever felt.