*UNEDITED*
Since she woke up with hazard memories. Yang repeatedly tells her that they are together. In other people's eyes, Setsura has become his woman. However, he hasn't touched her yet. Other than kissing her, he's done no such thing yet. Why? Yang didn't understand it very well. But, he felt that this woman differed from all the other women he screwed around with. He doesn't want to sleep with her to ease the loneliness in his heart. That is not the relationship he wants with her.