I don't really get Sebastian and Ciel's relationship. Someone help?

Well, according to most ppl, their relationship is just a typical master-servant relationship since Black Butler (Тёмный дворецкий) is a shonen manga/anime. But sometimes in the Манга and the anime, there are scenes that look like they are having a romantic relationship, even the Автор of the Манга сказал(-а) that intially the Манга was supposed to be a Яой manga, but her idea was rejected and she was forced to change the Манга into how it was now. So, the answer is quite ambiguous.