I might see both the QOP and Devil cards as natural, real, indulgent and sensual cards and consequently could see both of these cards complementing one another.
I do not start to see the Devil as totally negative additionally the image is often reported to be the pagan Jesus Pan whom represents primal masculine power of untamed natural instincts, procreation therefore the really nature of life it self. QOP is an earthy, normal card too and might have comparable basic instincts. I believe there may be a lot of passion.
But, i do believe these characteristics could too be taken far and you are clearly straight to have issues about obsession. I might maybe also caution over-indulgence, envy and possessiveness which may be part of also this mix.