I watched my mother masturbate several times when I was first becoming sexual. We had a very small house and her vibrator was very loud.
When I heard it, I’d tiptoe to her bedroom door and nudge it open a crack and watch her masturbate. Her bed faced the door and I saw her cum several times thrusting her ass and moaning.
I was less than 10 feet away and looking directly at her spread legs and hairy vagina. It made me so wildly horny that I sometimes couldn’t make it back to my room before I came and I’d just cum all over the hallway floor or even her bedroom door once.
This went on a few years and then we moved to a bigger house and I never saw her masturbate again but I have masturbated thinking about watching her cum many, many times since then.