For a religious man, Fyodor really likes the idea of being responsible for your downfall. There's nothing he loves more than taking his sweet, innocent lover and moulding them into his ideal lover, his personal porn. He doesn't actually care if you're not "pure" or "innocent", to him you can always get worse. The more kinks you have the more he can exploit, the less you have the more he can implant into your pretty head until you don't even remember they weren't your idea.