Thanks for the chapter!
This sure is going fast. However, she should've considered why a playboy was so interested in her other than being an experienced seducer and only slept with a woman once. Btw, the reason Don Juan gets startled or pleasantly surprised at her is due to a book can't remember the name of that dictates strict rules of etiquette between men and women along with what is considered proper sex which was driving him crazy with previous partners but because MC was completely missing and acting ignorant of said rules peaked his interest. (Sex is where woman just lies there like a cold tuna and does NOTHING, is suppose to be silent without moaning or groaning, and man quickly does his business. Flirting, talking, anal, oral, etc. is considered NG and barbaric.) This book is suppose to be given and instructed to men and women close to puberty but MC's father didn't to suppress any interest in the other sex and prevent her from getting too close to any men as wants to marry her off into royal family partially to improve family standing and mainly because after searching, examining and taking being her father really too far had decided that the Crown Prince was the only man good enough for her that could make her happy while protecting her.
Will probably be explained in twenty to thirty chapters but here's a brief explanation on quirks of royal family. The royal family are descended from dragons with an enormous OP amount of magic power appearing in men, (not sure how affects daughters or if all children are always sons.) Problem is that it slowly drives them crazy and is hard to control as they get older due to intensifying libido. Hence they need to find a wife to mark that'll stabilize them. Mark appears as a flower when he applies the spell while taking their virginity. Guys only get one chance to mark a woman and she HAS to be a virgin. He can get all the experience he wants but other than his chosen (or someone thinks is his chosen,) it'll be unpleasant, uninteresting and mostly unsatisfying sex for him. Basically only his chosen is his type and all other women really aren't his type. If woman not a virgin or something goes wrong and the mark doesn't stick the unlucky man will never be able to fully control his power and be essentially exiled to decrease risk to the people and will never become king. Reason for polygamy is due to the dragon blood their libido is increased and are trying to avoid wearing out or killing their chosen one by snu snu. Basically he'll be able to go all night every night without getting tired due to his lineage while wife just a normal human who'll have trouble keeping up. Then there's everybody who thinks only having sex under strict rules according to the stupid book of etiquette is proper.