I had always gone places with my best friend, but there was one place I had never gone.
I decided I'd show up at her house for a sleepover, so we could hang out.
She was really happy when I showed up, she smiled alot, and she had pre-rented some movies.
We put in this one movie, which had this really steamy sex scene. I was getting wetter by the minute as he caressed her breasts. I was under a blanket, so I gently rubbed my clit. I felt my climax coming up as she moaned louder as he thrusted his hard cock inside her. My climax was so high, my friend even felt the shake. She looked at me, and touched my leg. "Did it feel good?" I knew what she was talking about. She looked at me with an innocent smile. "My parents aren't home, show me." She sat up, and I took off the blanket and caressed my ever so sensitive clit.
She began rubbing her breasts as she watched me finger myself deeply. I moaned louder as she pulled down her panties to rub her own clit. I saw how incredibly wet she was, and that furthered my excitment. As we both reached our climax, I thought, we'd be best friends for life.

And we still occasionally fuck ourselves in front of each other, but we have other tools now too.