I am a 14 year old male. My sisters bedroom is right next to me, and I she talks on the phone a lot. Sometimes she stays up until 2 in the morning talking to her friends. We have very thin walls and I can clearly hear everything she says. I first started masturbating two years ago, but recently I realized I can only climax when I can hear the sound of her voice. I don't think it's the listening aspect of it, because while I was on vacation on my aunt's house, I tried masturbating while listening to my aunt talki to my uncle downstairs, and I just couldn't climax. It has to be her voice. Is this normal?
Anyways, hopefully you're not experiencing incestious feelings. It's quite possible the noise has become a comfort factor, but I'd be majorly uncomfortable with the whole thing.