Love reading the stories. I feel it is time I contributed too.
I was around 12 when this happened. It was summer and I was staying at my aunt and uncle's house for a week. They had a boy named James (my cousin) who was around 16 at the time. He and I got along great and he was almost like a big brother to me.
On this one morning, I got up and headed for James's room still in my nightie. I went in and James was getting his clothes out to put on. He was in his PJ bottoms and had also just got up. I noticed this funny smell in his room and asked James what it was. He turned a little red in the face and said 'I don't smell anything'. I then ran over to his bed and jumped in covering myself with his cover sheet. It was then that I felt this wet stuff on it against my bare arms.
I looked at it and could see it was slimy and white. I could also tell that this was where that smell was coming from. I threw the sheet off me and asked James 'What is this stuff on your sheet'? James just said 'Get out of there' almost mad like. About that time, my aunt walked in to say good morning to every body. I showed her the sheet and ask her 'What's all this stuff on James's sheet'? James was really red now. James then angrily said 'Get out of here'! I said 'All right!' and walked out.
I felt angry at James and my aunt knew it. She followed me and sat me down for a little 'girl to girl' talk. She told me that as I get older I'll understand things a lot more and that what was on James sheet was from his 'relieving' himself. She said all boys do this and it is natural and normal. I kept questioning my aunt and she just kept answering. She finally told me about how boys masturbate and about there sperm and what it looks like and how it come out. From her, I learned about erections, ejaculation, and much more. I soon realized what I had smelled and felt was James's sperm and how it got there.
Later that week when I was alone with James I told him 'I know what that stuff was now. Your mom told me. I understand now why you got so angry at me'. He said 'Good'.
It was years later before I got to see more of what my aunt had taught me about boys when I started becoming sexually active with them. It was at that time that I started calling that stuff on my cousin's sheet that morning cum. I've seen my share of this stuff now and long ago learned how to get it with my hand.