Emotional support...physical intimacy...both or more flirting or whatever else, Kingsley was there for her emotionally and physically. Living together certainly helped ensure he saw her, an advantage he had never had in the past with a woman, but truly, Kingsley did value that which was important and never missed anything truly important. The war took their focus, but life still happened in the meantime, and Kingsley wasn't about to disappear simply because the war was their first priority.
Part of what he had said had been a joke, as Emmeline was right. He didn't need another reason. There were so many, it would have taken ages to list them all off. But she was a reason. And when times got tough, more tough than usual, different reasons were better than others to help him stay focused, stay on the job, and not want to give up. Oh, Kingsley never gave up, but there were harder days. And if surviving in order to get to know Emmeline better, to explore being together, and to help her deal with her own issues helped him go on, then all the better. It certainly wasn't going to hurt that.
His focus went into the kiss though, and Kingsley slowly started to move them in the direction of the bedroom. There were other...options available, but at the moment, Kingsley felt more inclined toward the bed than utilizing the quite clean and clear kitchen counters. Another time, perhaps.
His forehead leaned against hers at the break, and Kingsley reached for the closed door into the hall toward the bedrooms. It hadn't been there originally, but he had been particularly thorough on security. It asked its question, and he whispered the answer hardly thinking about it, but he looked down at her about the promise she wanted.
"I promise," Kingsley replied, smiling again. He wasn't going to let her die, but that had always been the case, since he found out she was alive again. Pushing the door open behind her back, Kingsley kissed her yet again, though not to shut her up. If she had more to talk about, he would talk about it. But it really wasn't where his mind was at on his side.