spying on my brother's girlfriend

My brother is bringing his girlfriend home, and this girl is making me very hard, but she doesn't even register me, and I would like to see her naked. I can sneak into my brother's room when he's not around and put up a hidden camera to watch them get laid. the truth is I can't capture them while they're having sex, but I manage to have an interesting scene of his girlfriend after getting out of the shower while trying on panties beside the bed. the girl walks around in a thong, then puts on her clothes to go to work.