When I was growing up it wasn't unusual for parents to take nude pictures of their children.
I wouldn't say it was a tradition, but it was quite common, so almost every family album had pictures of the kids nude, the pictures were taken mostly when the kids were babies and until they weren't older than 6 or 7 years. So in my family's album there was a picture of me nude, the picture was took after a bath, so I'm there in the shower smiling in my birthday suit, I was like five years old. Now, family albums were things that mostly just collected dust in the closets, so that picture never occupied much of my thoughts, I was aware that it existed but I had no reason to care... until my cousin saw it.
Now my cousin and me were really close, we have the same age, and we lived in the same city, we were classmates in elementary school and in high school. Our families visited each other often, our house were like 8Km apart, so you guys get the idea.
Well, that's enough chat, let's talk about the main topic, when that happened we were 14 years old, her family was visiting us, so our parents were in the living room and we were in my room, I was playing videogames, I asked her if she wanted to play, but she preferred to just see me playing and tease me when I lost
She grabbed the album and she begun to pass the pages, she was pretty much uninterested in the pictures, just making comments like "look this, our parents were so young", "look, when we went to the beach" I just nodded or say something like "cool". Then she said "awww so cute" and then laughed a bit, I ignore her but I feel her eyes on me, I paused the game to see what's so important for her, she was smirking and pointing to my picture, more specifically to my penis, I was dying from embarrassment, I forget that picture existed, of course she teased me a lot, not in a mean way, she said things like "look at you, you look so adorable!" "this is my favorite picture now" "I'll ask Auntie if I can keep this picture" as a regular 14 old boy I tried to play it cool, like it was pretty much a non issue for me and I couldn't care less, but my face was telling a complete different story, she knew it was completely embarrassed, and she milked it a lot, she saw the rest of the pictures and I returned to my game, then she said "well, I'm going to see my favorite picture again" and she continue her teasing "look at that smile! You look so happy" "it's a pity that there's no more pictures like this".
So she kept smirking for the rest of the night, when they were leaving she gave me a hug and said something like "good night my nakey boy!"