I watched my best friend masturbating
I'm a guy, and my best friend is a girl. We are both 20. We hang out all the time and are really close friends but never "did" anything with each other. I went to her house in the evening to get her to do something together and when there was no answer at either of the doors I went to her bedroom window. Before I knocked I saw her in the room on the bed completely naked and rubbing her clit. My instinct was to turn away embarrassed but instead I stayed for the show. I was turned on by it totally and I have done this twice since. No one knows but me and I feel so guilty but I love watching her. God, is this normal? I feel weird talking to her and she doesn't know why. I feel bad but at the same time I'm starting to have feelings for her now.
is it normal to watch a girl masturbating who doesn't know you're there? And even if it's not acceptable is it normal to want to?
(Also she's a pretty girl, and single.)