Lyric discussion by cjm Monkay 

Cover art for Sister lyrics by She Wants Revenge

It makes me think of the end of the night, when your takin a girl home (2am) and your sobering up and you know that you should just go home, but the girl wants you to stay. In this case she's a catholic girl (maybe even a nun) too...and he's doubting his actions as he finally goes against his instincts. This girl is messed up and he's fully aware of it, he doesn't want to contribute to her already built up emotional baggage, but he gives into her lust. The chorus is the whole action.

The last part makes me think that she might have had multiple personalities (spoke in third person) and he had no idea how deeply she was troubled (questions unheard of) finally he saw the whole picture and realized why she acted the way she did (he saw everyone) and now he feels like shit for what he's let himself do.

I don't know I'm just guessing, but its a beautifully vivid song.