What I can say? I love this couple, because they are quite different in character, and their relationship was not easy - the amorous witch Sif and unsociable and dangerous destroyer Yaroslav. Can you imagine a more strange lovers, known the fact that their race (gods and demons) dislike each other since the beginning of time? You may read about them here - [link] Also take a look at comic about them - 'Once Upon a Time' by *sionra
Uncensored version in "Monochrome passions 2" Artbook