I just started playing, so if I'm complaining about something that will get fixed at some point later in the narrative, then I apologize, but presuming that's not the case, I would be remiss if I didn't make this point...
The fact that the black bull character is the protagonist's boss -- like, his actual supervisor in his workplace -- invalidates the point of interracial cuckolding. What makes interracial cuckolding sexy is the role reversal and the defiance of social norms. The fact that your wife/girlfriend leaves you not for a guy who's richer or of higher status than you, not for a guy who is superior to you in ways decent society deems acceptable (smarter, richer, prettier), but for a guy who occupies a lower rung on the social hierarchy than yourself. A guy who's superior to you in more brutal, primitive, non-socially-acceptable ways (bigger, meaner, tougher). Interracial cuckolding is sexy because it shows the guy who our social norms say is supposed to be the winner becoming the loser, and the guy who our social norms say is supposed to be the loser becoming the winner. Role reversal, see? THAT'S what makes it sexy. In other words, the rich, powerful guy is supposed to be the guy who GETS cucked, not the guy who cucks. The fact that the black bull is the boss eliminates the aspect of the role reversal and thus eliminates the sexiness, or at least reduces it by several orders of magnitude.
I'm sorry I didn't notice this game while it was still in development so I could have imparted this to you when it could still make a difference, but hopefully you can keep this lesson in mind for your future projects.
Thank you.