Arthur
He was her first, of course. It was no surprise to either of them really. They had done everything together and shared everything since she had first moved to Camelot. Even before then their father's had been close. Arthur was the brother she had never had and, unfortunately, never needed. They were great pals growing up, but once they became teenagers there were just too many differences. He grew into an arrogant snob and she was hardly any easier to get along with.
Yet, it was no surprise to her that after his first battle was finished it was her room he came too. Words were not spoken, but she held his gaze as he staggered towards her. When Arthur hesitated, it was she that took those final steps to him and crushed her lips to his.
Battle lust. She had heard the servants talk about it when they thought she wasn't paying attention. It was everything they said and more. Once he realized what she was offering, Arthur no longer held back. She was his. She always had been. It was not about romance or feelings. It was about need, survival, and possession, both grateful to have him in the castle once again.
It was exciting for Morgana. There was no clumsy beginning to her sex life. Arthur ravished her, with all the ferocity of any seasoned soldier. He was not gentle, though, he never hurt her. It was a delightful change from spending her whole life in the hands of people who thought she was fragile. With his hands on her hips and him pressed against her from behind, she finally realized what it was like to be treated as a woman. She was no longer the lost child that arrived in Camelot.