I think the it's about two siblings, sister is looking over brother..
she's a whore or in a similar line of work and she has to do it in order to feed and educate her brother..
but as fate has it brother being the horny bastard he is, goes to the place where his unfortunate sister works, thus ruining things for the two of them..
you get marks for adding so much beauty to this old story
hope I got the meaning right lol