Is it normal to be sexually aroused looking at your sister's ass?
I'm talking just the visual here. I don't want to fondle it. That would be just too creepy. But she has one of those bubble butts that I've seen naked and bouncing around as she has walked away from me. She has no concern of me seeing her naked ass. We have been close friends since we were kids. But the sight of her ass has always given me a boner. Is this normal?