For all her occasional bluster and her recklessness in battle, Diana was very much the opposite in romantic matters. As an example, things might never have happened between her and Steve at all if he had not taken the lead. And so most of this situation with Thor was Diana's simple confusion of not knowing whether she was to pursue the things she was feeling, or let them lie.
But when Thor called them partners again, in such a circumstance as this, and sealed the matter with another soft kiss, Diana could hardly let that lie. "If that is what you'd have of me," she murmured when he pulled his mouth away, and she did not quite give him a chance to answer before she kissed him again.
It was by no means fierce or forceful, but soft and sweet would not quite have been the words, either.