I'm guessing three years have passed because Wolfgang said the thing about the 3rd prince confronting him was three years ago
Yes three years have passed because when Dandy/Delly was introduced he was 10 but now he's 13.
And I think either it just happened in the flow of his confession or it was kind of their plan because black haired guy probably wanted to do anything he could to avoid losing his virginity to the king or just be associated with him. Either that or Wolfgang never predicted he'd be caught and this would happen because the hickey was gonna disappear at some point or the other. And for the last question, the black haired guy (soohuk) is now with his dad because he was bansihed from the palace and yes he's still pretending to be sick because they have a plan to take the king down.
im confused, how much of a time skip was fhere? and why would wolfgang suck black haired glasses guy's neck knowing he'd be thrown out?? was that on purpose or an accident? where is black haired glasses guy now, is he really still pretending to be sick after all these years???? pls help ヽ(`Д´)ﾉ