The answer is "The Vulpine" and "It was logical deduction". Then, you can talk to him again and say you're going to "blackmail him into having your way with him".
I worked out the riddle and got "drac" as the correct answer, however the NPC insisted on vulp... turns out there's two solutions.
lists below are from left to right, with the properties (coat color, drink, clothing, fetish, species).
solution1:
(blue,vodka,teddy,bdsm,drac),
(hazel,mead,gstring,voy,equine),
(blonde,gin,stockings,pee,vulp),
(white,wine,corset,tent,lup),
(grey,beer,babydoll,feet,feline)
solution2:
(blue,vodka,teddy,pee,drac),
(hazel,mead,gstring,voy,equine),
(blonde,gin,stockings,bdsm,vulp),
(white,wine,corset,tent,lup),
(grey,beer,babydoll,feet,feline)