I don’t think she gives a red rat’s patootie about Stefano or his children. I think this invitation, or I should say command, from Stefano for her to return was the perfect excuse Kristen was looking for to get back at some people, and now that it’s been provided for her, she’ll play nice on the outside, while getting herself a boatload of revenge on the inside, first and foremost being John and Marlena ….. and what better way for her to accomplish that than by seducing John’s son. Brady is headstrong and does not always think before he acts either, so I see big problems heading their way resulting in all of them playing right into Stefano’s hands. DAMN THOSE DIMERAS!