How has P&K's relationship changed? 5:1: 115- end

In lines 115 to the end of the Act, this is one of the first signs that the relationship has changed. The once uptight and aggressive Katherina is now showing her affection and love towards Petruchio. When they first got together she would dream of kissing him willing let alone in public, but here she is. The arguing has stopped and the relationship is lots happier, this could be because he has tamed her or maybe she just has feelings for her. Petruchio says 'First kiss me,' it could be interpreted as a controlling way, and her reply, ' I will give thee a kiss' as he obeying what he said and giving in to not make a scene. But it could also indicate that she has fallen in love with him. and he previous attitude to him has changed.