This is what happens with me and my sister
This only happened a few weeks ago.
I was in my room totally naked watching tv, I love being naked because it makes me feel comfortable. My sister who is a few years younger than me walks into my room without knocking. She stares at me and walks out again, I call her back and tell her that being naked is perfectly fine, and natural. She askes me if she can get naked with me to, I said that she could.
At this point I had a really big hard on, my sister asks me why it is like that, I say that it happens when it's excited, and I tell her that I rub it to get it down. I start jacking off, and my sister is just staring at my cock, she is enjoying this as much as I am. She askes me if she can rub it, I let her, after like 30 secs I'm about to cum, I tell her and she rubs faster.
I squirt my cum all over her chest, I clean it off her with a spare sock. Then I ask her is she has masturbated before, she says no. I ask her if she can do it, so she starts jilling her hairless pussy. She closes her eyes as she's doing it, so I gave her a hand and start to rub her clit. She is getting really excited and starts having having an orgasm. When she finishes she asks me what happened, I tell her that she had a orgasm and that I'm proud of her.
I hug her and watch tv for the rest of the night. I hope that we do this again sometime.