If there's anything she loves, it's when Killian gets speechless over her. So she smiles wickedly when he can't quite get out his words.

When he does, she trusts him to keep them balanced on the swing (because she trusts him fully with herself), releases her grip on the chains and takes hold of both of his lapels. Almost like the first time they kissed in Neverland, except this timing knowing it's going to be that good, she pulls him to her and just plain takes his mouth.