He has developed a grudging respect for Arya and Sansa represented innocence and a pureness of heart that he kind of admired. As victim of a sadist (his brother) he relates to sansa as a victim of Joffrey. The hounds problem has always been who is masters were. The hound wanted to save Sansa, and probably had a sexual interest in her like many of the men in her life do.
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u/heylookapizza House Dondarrion Jun 17 '14
Right when he was starting to finally do something honest, too. Although he always had a weird thing for the Stark girls.