In my opinion, Marcus, because of his family origin and not coming with a frustrating past as a kit, he is one of those who think they are too young to accept a great responsibility such as supporting, maintaining, entertaining, educating and being there for some children, that is not why he can be angry for his way of thinking of both kit and marcus, each one is free to want to wait for what he wants, in my opinion marcus is a free spirit, it also shows that there is no past evidence that there is more than a good friendship of friends or failing that of brothers since there has been no sexual approach of any kind. I think Kit will meet someone else, perhaps in the park, when her little brother is out of sight and found by another young man. In addition, we must break that scheme where the only friend of all life is the favorite love, it would be too forced, do you really want to wait for that?