I'm sorry for spelling mistakes, english is my second language, but I hope you understand.
This happend last Friday when I was home alone, with my sister.
My sister came into my room one day, and wondered if she could ask me something.
'Sure' I said.
'Cool, so, I was just wondering... is it true that guys pee, when they masturbate?'
My sis and I didn't usually talk a lot about sex, but I guess she was just curious.
'Its not pee, its sperm, that stuff that babies comes from.'
'Ok, I see, my friend Natalie told me it was pee' She said.
'Well, then she is wrong' I said 'Was is anything else?'
'Yes, does it comes sperm when you masturbate?'
I got a little embarrassed.
'Cool' she took a little break 'Will you let me watch you, when you sperm?'
'Ehm, I don't know...' I said
'Please' she said, looked at me and smiled 'It's only us home, and I promise not to tell anyone'
'Ok, but you have to promise not to tell anyone, ok?'
'I promise' she said and smiled 'Show me'
I stood up, and pulled my pants down, and did the same with my boxers. There I stood, half naked, with a semihard dick, in front of my sister.
I sat back down. She looked at my dick, while it got harder.
'Oh, I didn't know your penis was that big she said.'
I took my dick in my right hand, and started stroking slowly.
I got even more horny having my sister watch me, so I know it wouldn't take long before I cum.
I stroked faster and faster. I looked over at my sister, she had her eyes on my dick. I knew I had to cum very soon, so I told her. 'I'm gonna cum any second now' she smiled, while she had her eyes on my dick.
Then I got one of my best orgasms, I felt the cum, and I shot more than I ever have before.
'Wow' She said 'That was really cool, how did it feel?'
'Great' I said and smiled
'So you didn't mind that I watched you?'
'No, it was actually a little fun to have you watch me'
'Cool, so maybe I can watch you again?'
'Yes, I guess' I said
'Thanks for showing me' She smiled, and left.