This is the story that happened to me when I was 21 years old.
Well I got started into the whole CNFM scene when one day my cousin Helen was coming home to spend the night because the next day she had to go in early for work and it was easier for her to spend the night at the house so it would give her more time to sleep.
At that time I was in college with a part-time job still living with my parents. I was living in the basement and I had my own restroom.
I came back from working out that day and it was around 5:30 when I got home. My mom had told me that both her and my dad where going to my uncles house, which meant they were not coming home until late at night or probably past midnight since all they did was get together and get drunk. She reminded me that my cousin was coming sometime and I told her that I already knew.
It was customary for my family to leave the back door open anytime there was anyone in the house and my whole family knew this so every time that someone came visit us they would just come in through the back door.
I headed to my room in the basement, put on the music really loud knowing my parents were going out they would not care. I took off all my clothes and proceeded to get in the shower. About thirty minutes later I came out the shower. I dried off and stepped into my room fully naked, the music was still really loud so I could not hear anything. I felt a presence in my room and I looked behind me and see my cousin sitting on my bed staring at my cock just smiling. I must have turned red right away and tried to cover my genitals with both hands. I headed to the computer still naked and took one hand off my penis to turn off the music.
I was a bit upset and embarrassed that she had seen me naked and didn't bother to tell me when she came in so I let her know. I asked her why didn't she knock on the door or something while still trying to cover my penis. She just sat there smiling with her eyes only looking at me when I spoke to her then she just stared at my hands on my penis. She told me to stop being so uptight, that watching me naked wasn't a big deal and that I shouldn't bother with covering my 'thing' because she had already seen it.
This got me even more pissed and asked her if she was out of her mind but she insisted that it was cool and she would actually like to see my penis again because she liked it and then she told me "come on, I won't tell anyone I promise". Her compliment made me feel more confident and so I took my hands off my penis and she put an even bigger smile on her face when she saw it.
Again she said it was nice and she told me I was not circumcised like most of the guys she saw and she really liked that.