Both My Mother and My Sister...
Shortly after beginning to experiment with my sister's clothes, I was caught by both my mother and sister. A girl down the street had a dress for school that was made of some polyester fabric that caught the breeze and moved in ways that boys' clothes simply don't. When my sister and I walked to school, I made it a point of trying to time it so that we walked just behind the group the other girl was in. I just loved how the dress moved on her.
My sister got the same dress in a different color. I so wanted to try it on and see how it felt but I didn't dare. The idea was enticing though, so I snuck out some of her older things and satisfied myself trying on her underwear, blouses and skirts. I did this any time I was home alone.
One afternoon I tried on this dress. It was as silky as I imagined and it slid so nicely against the nylon panties I had on underneath. I tested it several times by rubbing my hands up and down my front and back. My mother had come home in the meantime and came upstairs to find me. She came into my room and I was wearing the dress. I think she also saw me rubbing the material against my pantied bottom.
At first she said nothing, then sat me down on the bed and wanted to talk about why I was wearing the dress, asked how often I did this and lectured me on why i shouldn't take my sister's things. And of course while this was going on, my sister came home and saw the two of us in my room, sitting on the bed with me in her dress. She laughed and then asked what was going on.
Without hesitation, my mother explained that I was curious about her clothing and had tried on the dress but repeated what I had said about this being the first time. My sister didn't believe it and I don't think my mother really did. My sister asked if I was wearing her underwear too. My mother made me tell her I was but said I didn't have to show them. My sister asked if I got spanked or was getting a spanking and my mother said no. I promised I'd never do it again and my mother gave me a hug before getting up and the two of them left so I could change.
The next day my sister decided I deserved a spanking anyway, so after school and before my parents came home from work I had to model the dress for her again and ended up over her knee.