By what the writers have been telling, I guess that with all that the Winchesters have been through in last 3-4 seasons, they are trying somewhat to eventually let go a bit of baggage from their relationship, and trying to mend it. So I guess we we will have a bit of fun episodes before the Mark of Cain again comes to the forefront..and I am totally in the mood for fun episodes and taking break from the heavy stuff for now. 😆