  Mollow physics in the two-photon regime shows interesting features such as
path-controlled time-reordering of photon pairs without the need to delay them.
Here, we calculate analytically the two-photon correlations $ g^{(2)}(\tau)$,
essential to discuss and study such phenomena in the resonant-driven
dressed-state regime. It is shown that there exists upper and lower bounds of
the $ g^{(2)}(\tau)-$ function for certain spectrally-selected photon pairs.
Recent reported experiments agree with the presented theory and thereby it is
shown that the resonant-driven four-level system is an interesting source for
steerable quantum light in quantum cascade setups. We furthermore discuss the
unlikeliness to observe antibunching for the delay time $ \tau=0 $ in the
exciton-biexciton correlation functions in such experiments, since antibunching
stems from a coherent and in-phase superposition of different photon emission
events. Due to the occuring laser photon scattering, this coherent
superposition state is easily disturbed and leads to correlation functions of $
g^{(2)}(0)=1$.
