In your opinion, its could be saying that it was his destiny to become cuckold?
A little late to respond, but I think the game makes it very clear is was absolutely not a cuckold before the events of the game, if only a little passive.
The game makes it very clear that the only reason he is willingly to be cucked, and his ED, is because of the Doctor. We see that everytime the MC gets more beta-like, including suggesting Yuki get ntred and having ED, is right after seeing the Doctor. The Doctor obviously used his mind control/suggestion on him, just like Yuki. There is more, in one CG with the Old Man, Yuki asks him why the Ryoto(That's the MC's name) has to make tributes to the Hero Association, and he states planely that he did it to pay off the Association so they didn't try anything on Yuki. Why would a man who enjoys getting cucked pay off a ton of money to avoid it? Another example in another CG is when Yuki is being mind controlled and NTRed right in front of Ryoto, and Ryoto becomes so distraught that the person NTRing Yuki decides to use mind control on Ryoto so he doesn't end his own life from despair. Would a man who was destined to be a cuck need to be mind controlled so they didn't end their life from being cucked?
In short, no, the MC was not destined to be a cuck. It's only because of mind control.