My family shared a vacation home with my mother’s sister. We were really young then, and my mother’s sister was recently married. She was twenty, but to an eleven year old that’s old enough.
In any event the bathroom that she and her husband shared had a tub and not a shower. She came over to the bathroom in my parent’s room, with a shower. I walked in on her, the curtain was open, and she was lathering herself.
I stood there, and watched. I felt my mother’s hand on my hair as she hauled me back into the bedroom. Up till then she had never bawled me out, but not that day. The day I caught my aunt masturbating in the shower.