(Immortals) Theseus- Up
IMHO he sees Sansa in a way as a substitute for his little sister (you know, the one Gregor killed). In an incredibly fucked up way, yes, because there's the kiss part and all that jazz (But then, Westeros in general is an incredibly fucked up place). But I think that he kind of thinks that he could manage to save Sansa where he failed to save his sister.

Idk if this makes sense, it's late here and I might be a wee bit sleepy.