First of all, thank you for your comprehensive answer.
Hmm, if I remember correctly my protagonist wasn't exactly rejected by Feraldo upon landing on Harmonia. I should check, though. Oh, is there perhaps a chance you're somewhat behind in fullfilling vital quests, because you just started? Then again you already collected the GC, right? It's confusing not gonna lie. Thinking back, Feraldo told me he was looking forward to hunting me in the forest to which I replied let's see who ends up as prey in the end... So as you can see, agreeing to become Feraldo's omega is definitely not the only way to become his... partner. But it seems that at least for now, dominating or getting dominated is the only relationship you can actually have – not too surprising all things considered – so perhaps similar in nature to the dynamic you can have with the king. Granted, I wouldn't know since I didn't choose that option. My guess is "Feraldo the big pupper" route isn't established yet...
Now that I'm reading this I feel utterly foolish for reloading the previous save every time the lotto was unsuccessful. Truly a chore haha. If that is true then 'earning' 1 Million GC is far easier than I thought. Although I'd rather fight worthy opponents than spent my time pressing a single button, this is at least acceptable instead of being outrageously time consuming and thus tedious. Well, still somewhat tedious but anyway.
This question might become obsolete: In order to trigger the goblin, vampire etc. quests on Harmonia, do I talk to the king at, what was it, 10pm to maybe 1am? Previously it was 8pm (thought he meant "am" and panicked a little...)
PS: Is the part about Feraldo somehow censored due to it's nature of being spoiler territory ?